all comments disappear when mentions (@user) are used in comments

[Schmuuu]

Steps to reproduce

1. Share any file with another user on the Nextcloud server
2. write a comment like 'test' for that file
3. refresh the page and see the added comment listed
4. write a second comment for that file and mention the user the file was shared with in that comment with @user
5. refresh the page and see all(!) comments got lost

I described the problem in the forum a while ago and was asked to open an issue here. But you can find some screenshots there:
https://help.nextcloud.com/t/nc11-written-comments-vanish-and-comments-with-username-dont-get-written/6375/7

Expected behaviour

I would expect all comments to be listed in the comments section of the file.

Actual behaviour

As soon as there is a comment containing a mention (@user) all comments vanish and the comment section is clean. It doesn't say there is no comment as usually, it is just plain white. You can still enter new comments and directly after submitting them, they are visible. But the new comment will also disappear after refresh. So as soon as there are mentions in the comments for a file/ folder there will no longer be any comments visible on the NC GUI in the comment section.

Server configuration

Operating system: Ubuntu 16.04 LTS

Web server: Apache 2.4.18

Database: mysql 5.7.17

PHP version: 7.0.15

Nextcloud version: 11.0.2 (stable)

Updated from an older Nextcloud/ownCloud or fresh install: Was a fresh install of 10.0 and meanwhile upgraded to 10.2, 11.0, 11.0.1 and today 11.0.2.
The problem was first seen on 11.0.0 when the feature was introduced. I hoped it was fixed with 11.0.1 or now with 11.0.2 but the problem still persists.

Where did you install Nextcloud from: Download package and later the updater app

Signing status:

Signing status

No errors have been found.

List of activated apps:

App list

Enabled:

• activity: 2.4.1
• admin_audit: 1.1.0
• announcementcenter: 3.0.0
• audioplayer: 1.4.1
• calendar: 1.5.1
• comments: 1.1.0
• contacts: 1.5.3
• dav: 1.1.1
• direct_menu: 0.10.0
• external: true
• federatedfilesharing: 1.1.1
• files: 1.6.1
• files_accesscontrol: 1.1.2
• files_downloadactivity: 1.0.0
• files_pdfviewer: 1.0.1
• files_sharing: 1.1.1
• files_texteditor: 2.2
• files_trashbin: 1.1.0
• files_versions: 1.4.0
• files_videoplayer: 1.0.0
• firstrunwizard: 2.0
• gallery: 16.0.0
• logreader: 2.0.0
• lookup_server_connector: 1.0.0
• nextcloud_announcements: 1.0
• notifications: 1.0.1
• password_policy: 1.1.0
• provisioning_api: 1.1.0
• serverinfo: 1.1.1
• sharebymail: 1.0.1
• spreed: 1.2.0
• systemtags: 1.1.3
• tasks: 0.9.5
• templateeditor: 0.2
• theming: 1.1.1
• twofactor_backupcodes: 1.0.0
• twofactor_totp: 1.1.0
• updatenotification: 1.1.1
• workflowengine: 1.1.1
  Disabled:
• encryption
• federation
• files_automatedtagging
• files_external
• files_retention
• survey_client
• user_external
• user_ldap
• user_saml

The content of config/config.php:

Config report

{
"system": {
"passwordsalt": "REMOVED SENSITIVE VALUE",
"secret": "REMOVED SENSITIVE VALUE",
"trusted_domains": [
"localhost",
"192.168.178.200",
"REMOVED SENSITIVE VALUE"
],
"datadirectory": "/var/ncdata",
"overwrite.cli.url": "https://cREMOVED SENSITIVE VALUE.net/",
"dbtype": "mysql",
"version": "11.0.2.7",
"dbname": "nextcloud_db",
"dbhost": "localhost",
"dbport": "",
"dbtableprefix": "oc_",
"dbuser": "REMOVED SENSITIVE VALUE",
"dbpassword": "REMOVED SENSITIVE VALUE",
"log_type": "owncloud",
"logfile": "/var/ncdata/nextcloud.log",
"logtimezone": "CET",
"installed": true,
"instanceid": "ocy9r9oj7fyg",
"appstore.experimental.enabled": true,
"mail_smtpmode": "smtp",
"mail_smtpauth": 1,
"mail_smtpport": "587",
"mail_smtphost": "REMOVED SENSITIVE VALUE",
"mail_smtpauthtype": "LOGIN",
"mail_from_address": "REMOVED SENSITIVE VALUE",
"mail_domain": "REMOVED SENSITIVE VALUE",
"mail_smtpsecure": "tls",
"mail_smtpname": "REMOVED SENSITIVE VALUE",
"mail_smtppassword": "REMOVED SENSITIVE VALUE",
"preview_libreoffice_path": "/usr/bin/libreoffice",
"enabledPreviewProviders": [
"OC\Preview\PNG",
"OC\Preview\JPEG",
"OC\Preview\GIF",
"OC\Preview\BMP",
"OC\Preview\XBitmap",
"OC\Preview\MP3",
"OC\Preview\TXT",
"OC\Preview\MarkDown",
"OC\Preview\TIFF"
],
"memcache.local": "\OC\Memcache\Redis",
"filelocking.enabled": true,
"memcache.distributed": "\OC\Memcache\Redis",
"memcache.locking": "\OC\Memcache\Redis",
"redis": {
"host": "/var/run/redis/redis.sock",
"port": 0,
"timeout": 0,
"dbindex": 0
},
"maintenance": false,
"updater.server.url": "https://updates.nextcloud.com/updater_server/",
"updater.release.channel": "stable",
"loglevel": 0,
"theme": ""
}
}

Are you using external storage, if yes which one: No

Are you using encryption: No

Are you using an external user-backend, if yes which one: No

Client configuration

Browser: Firefox 45.7.0 ESR / MS Edge latest version

Operating system: Windows 10 Pro

Logs

Web server error log

Web server error log

[Sat Mar 04 11:28:05.178750 2017] [mpm_prefork:notice] [pid 1320] AH00169: caught SIGTERM, shutting down
[Sat Mar 04 11:47:40.052737 2017] [:notice] [pid 6315] mod_qos(009): loaded MPM is 'prefork' but mod_qos should be used with MPM 'Worker' only.
[Sat Mar 04 11:47:40.053070 2017] [:warn] [pid 6315] mod_qos(009): mod_unique_id not available (mod_qos generates simple request id if required)
[Sat Mar 04 11:47:40.263002 2017] [:notice] [pid 6316] mod_qos(009): loaded MPM is 'prefork' but mod_qos should be used with MPM 'Worker' only.
[Sat Mar 04 11:47:40.263164 2017] [:warn] [pid 6316] mod_qos(009): mod_unique_id not available (mod_qos generates simple request id if required)
[Sat Mar 04 11:47:40.275006 2017] [mpm_prefork:notice] [pid 6316] AH00163: Apache/2.4.18 (Ubuntu) OpenSSL/1.0.2g mod_qos/11.21 configured -- resuming normal operations
[Sat Mar 04 11:47:40.275094 2017] [core:notice] [pid 6316] AH00094: Command line: '/usr/sbin/apache2'
[Sat Mar 04 11:58:11.065923 2017] [mpm_prefork:notice] [pid 6316] AH00169: caught SIGTERM, shutting down
[Sat Mar 04 11:58:12.224915 2017] [:notice] [pid 6593] mod_qos(009): loaded MPM is 'prefork' but mod_qos should be used with MPM 'Worker' only.
[Sat Mar 04 11:58:12.225977 2017] [:warn] [pid 6593] mod_qos(009): mod_unique_id not available (mod_qos generates simple request id if required)
[Sat Mar 04 11:58:12.678180 2017] [:notice] [pid 6594] mod_qos(009): loaded MPM is 'prefork' but mod_qos should be used with MPM 'Worker' only.
[Sat Mar 04 11:58:12.678355 2017] [:warn] [pid 6594] mod_qos(009): mod_unique_id not available (mod_qos generates simple request id if required)
[Sat Mar 04 11:58:12.691317 2017] [mpm_prefork:notice] [pid 6594] AH00163: Apache/2.4.18 (Ubuntu) OpenSSL/1.0.2g mod_qos/11.21 configured -- resuming normal operations
[Sat Mar 04 11:58:12.691415 2017] [core:notice] [pid 6594] AH00094: Command line: '/usr/sbin/apache2'
[Sat Mar 04 15:13:40.320822 2017] [mpm_prefork:notice] [pid 6594] AH00169: caught SIGTERM, shutting down
[Sat Mar 04 15:13:41.289211 2017] [:notice] [pid 8639] mod_qos(009): loaded MPM is 'prefork' but mod_qos should be used with MPM 'Worker' only.
[Sat Mar 04 15:13:41.289654 2017] [:warn] [pid 8639] mod_qos(009): mod_unique_id not available (mod_qos generates simple request id if required)
[Sat Mar 04 15:13:41.523740 2017] [:notice] [pid 8640] mod_qos(009): loaded MPM is 'prefork' but mod_qos should be used with MPM 'Worker' only.
[Sat Mar 04 15:13:41.523925 2017] [:warn] [pid 8640] mod_qos(009): mod_unique_id not available (mod_qos generates simple request id if required)
[Sat Mar 04 15:13:41.544083 2017] [mpm_prefork:notice] [pid 8640] AH00163: Apache/2.4.18 (Ubuntu) OpenSSL/1.0.2g mod_qos/11.21 configured -- resuming normal operations
[Sat Mar 04 15:13:41.544180 2017] [core:notice] [pid 8640] AH00094: Command line: '/usr/sbin/apache2'

Nextcloud log (data/nextcloud.log)

Nextcloud log

{"reqId":"/dscqEot2zkseNBrOVNU","remoteAddr":"","app":"cron","message":"Run OCA\Files_Sharing\ExpireSharesJob job with ID 10","level":0,"time":"2017-03-04T22:30:04+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"/dscqEot2zkseNBrOVNU","remoteAddr":"","app":"cron","message":"Finished OCA\Files_Sharing\ExpireSharesJob job with ID 10","level":0,"time":"2017-03-04T22:30:04+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"/dscqEot2zkseNBrOVNU","remoteAddr":"","app":"cron","message":"Run OCA\Files\BackgroundJob\ScanFiles job with ID 11","level":0,"time":"2017-03-04T22:30:04+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"/dscqEot2zkseNBrOVNU","remoteAddr":"","app":"OC\Files\Cache\Scanner","message":"!!! Path '' is not accessible or present !!!","level":0,"time":"2017-03-04T22:30:04+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"/dscqEot2zkseNBrOVNU","remoteAddr":"","app":"cron","message":"Finished OCA\Files\BackgroundJob\ScanFiles job with ID 11","level":0,"time":"2017-03-04T22:30:07+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"/dscqEot2zkseNBrOVNU","remoteAddr":"","app":"cron","message":"Run OCA\DAV\CardDAV\SyncJob job with ID 180","level":0,"time":"2017-03-04T22:30:07+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"/dscqEot2zkseNBrOVNU","remoteAddr":"","app":"cron","message":"Finished OCA\DAV\CardDAV\SyncJob job with ID 180","level":0,"time":"2017-03-04T22:30:07+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"/dscqEot2zkseNBrOVNU","remoteAddr":"","app":"cron","message":"Run OCA\NextcloudAnnouncements\Cron\Crawler job with ID 182","level":0,"time":"2017-03-04T22:30:07+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"/dscqEot2zkseNBrOVNU","remoteAddr":"","app":"cron","message":"Finished OCA\NextcloudAnnouncements\Cron\Crawler job with ID 182","level":0,"time":"2017-03-04T22:30:07+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"au4z53EORfhR4HHv6HFF","remoteAddr":"192.168.178.35","app":"webdav","message":"Exception: {"Message":"HTTP\/1.1 401 No 'Authorization: Basic' header found. Either the client didn't send one, or the server is misconfigured","Exception":"Sabre\\DAV\\Exception\\NotAuthenticated","Code":0,"Trace":"#0 [internal function]: Sabre\\DAV\\Auth\\Plugin->beforeMethod(Object(Sabre\\HTTP\\Request), Object(Sabre\\HTTP\\Response))\n#1 \/var\/www\/nextcloud\/3rdparty\/sabre\/event\/lib\/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\n#2 \/var\/www\/nextcloud\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php(466): Sabre\\Event\\EventEmitter->emit('beforeMethod', Array)\n#3 \/var\/www\/nextcloud\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php(254): Sabre\\DAV\\Server->invokeMethod(Object(Sabre\\HTTP\\Request), Object(Sabre\\HTTP\\Response))\n#4 \/var\/www\/nextcloud\/apps\/dav\/appinfo\/v1\/webdav.php(60): Sabre\\DAV\\Server->exec()\n#5 \/var\/www\/nextcloud\/remote.php(165): require_once('\/var\/www\/nextcl...')\n#6 {main}","File":"\/var\/www\/nextcloud\/3rdparty\/sabre\/dav\/lib\/DAV\/Auth\/Plugin.php","Line":168,"User":"USER"}","level":0,"time":"2017-03-04T22:33:15+01:00","method":"PROPFIND","url":"/remote.php/webdav/","user":"USER","version":"11.0.2.7"}
{"reqId":"opBLI5aCg534aE5jUmOP","remoteAddr":"192.168.178.35","app":"admin_audit","message":"File accessed: "/Nextcloud Manual.pdf"","level":1,"time":"2017-03-04T22:37:36+01:00","method":"GET","url":"/remote.php/webdav/Nextcloud%20Manual.pdf","user":"ncadmin","version":"11.0.2.7"}
{"reqId":"qBc5i0YFQBI5r0s2gL6I","remoteAddr":"192.168.178.35","app":"webdav","message":"Exception: {"Message":"HTTP\/1.1 401 No 'Authorization: Basic' header found. Either the client didn't send one, or the server is misconfigured","Exception":"Sabre\\DAV\\Exception\\NotAuthenticated","Code":0,"Trace":"#0 [internal function]: Sabre\\DAV\\Auth\\Plugin->beforeMethod(Object(Sabre\\HTTP\\Request), Object(Sabre\\HTTP\\Response))\n#1 \/var\/www\/nextcloud\/3rdparty\/sabre\/event\/lib\/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\n#2 \/var\/www\/nextcloud\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php(466): Sabre\\Event\\EventEmitter->emit('beforeMethod', Array)\n#3 \/var\/www\/nextcloud\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php(254): Sabre\\DAV\\Server->invokeMethod(Object(Sabre\\HTTP\\Request), Object(Sabre\\HTTP\\Response))\n#4 \/var\/www\/nextcloud\/apps\/dav\/appinfo\/v1\/webdav.php(60): Sabre\\DAV\\Server->exec()\n#5 \/var\/www\/nextcloud\/remote.php(165): require_once('\/var\/www\/nextcl...')\n#6 {main}","File":"\/var\/www\/nextcloud\/3rdparty\/sabre\/dav\/lib\/DAV\/Auth\/Plugin.php","Line":168,"User":"USER"}","level":0,"time":"2017-03-04T22:43:16+01:00","method":"PROPFIND","url":"/remote.php/webdav/","user":"USER","version":"11.0.2.7"}
{"reqId":"3R9P6XIm1cKUcSdP6E1m","remoteAddr":"","app":"cli","message":"Memcache \OC\Memcache\Redis not available for local cache","level":1,"time":"2017-03-04T22:45:01+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"3R9P6XIm1cKUcSdP6E1m","remoteAddr":"","app":"cli","message":"Memcache \OC\Memcache\Redis not available for distributed cache","level":1,"time":"2017-03-04T22:45:01+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"3R9P6XIm1cKUcSdP6E1m","remoteAddr":"","app":"cron","message":"Run OCA\UpdateNotification\Notification\BackgroundJob job with ID 4","level":0,"time":"2017-03-04T22:45:01+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"3R9P6XIm1cKUcSdP6E1m","remoteAddr":"","app":"cron","message":"Finished OCA\UpdateNotification\Notification\BackgroundJob job with ID 4","level":0,"time":"2017-03-04T22:45:01+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"3R9P6XIm1cKUcSdP6E1m","remoteAddr":"","app":"cron","message":"Run OCA\Files_Trashbin\BackgroundJob\ExpireTrash job with ID 5","level":0,"time":"2017-03-04T22:45:02+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"3R9P6XIm1cKUcSdP6E1m","remoteAddr":"","app":"cron","message":"Finished OCA\Files_Trashbin\BackgroundJob\ExpireTrash job with ID 5","level":0,"time":"2017-03-04T22:45:02+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"3R9P6XIm1cKUcSdP6E1m","remoteAddr":"","app":"cron","message":"Run OCA\Files\BackgroundJob\DeleteOrphanedItems job with ID 12","level":0,"time":"2017-03-04T22:45:02+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"3R9P6XIm1cKUcSdP6E1m","remoteAddr":"","app":"cron","message":"Finished OCA\Files\BackgroundJob\DeleteOrphanedItems job with ID 12","level":0,"time":"2017-03-04T22:45:02+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"3R9P6XIm1cKUcSdP6E1m","remoteAddr":"","app":"cron","message":"Run OCA\Files\BackgroundJob\CleanupFileLocks job with ID 13","level":0,"time":"2017-03-04T22:45:02+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"3R9P6XIm1cKUcSdP6E1m","remoteAddr":"","app":"cron","message":"Finished OCA\Files\BackgroundJob\CleanupFileLocks job with ID 13","level":0,"time":"2017-03-04T22:45:02+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"3R9P6XIm1cKUcSdP6E1m","remoteAddr":"","app":"cron","message":"Run OC\Authentication\Token\DefaultTokenCleanupJob job with ID 14","level":0,"time":"2017-03-04T22:45:02+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"3R9P6XIm1cKUcSdP6E1m","remoteAddr":"","app":"no app in context","message":"Invalidating session tokens older than 2017-03-03T21:45:02+00:00","level":0,"time":"2017-03-04T22:45:02+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"3R9P6XIm1cKUcSdP6E1m","remoteAddr":"","app":"no app in context","message":"Invalidating remembered session tokens older than 2017-02-17T21:45:02+00:00","level":0,"time":"2017-03-04T22:45:02+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"3R9P6XIm1cKUcSdP6E1m","remoteAddr":"","app":"cron","message":"Finished OC\Authentication\Token\DefaultTokenCleanupJob job with ID 14","level":0,"time":"2017-03-04T22:45:02+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"3R9P6XIm1cKUcSdP6E1m","remoteAddr":"","app":"cron","message":"Run OCA\Activity\BackgroundJob\EmailNotification job with ID 6","level":0,"time":"2017-03-04T22:45:03+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"3R9P6XIm1cKUcSdP6E1m","remoteAddr":"","app":"cron","message":"Finished OCA\Activity\BackgroundJob\EmailNotification job with ID 6","level":0,"time":"2017-03-04T22:45:03+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"3R9P6XIm1cKUcSdP6E1m","remoteAddr":"","app":"cron","message":"Run OCA\Activity\BackgroundJob\ExpireActivities job with ID 7","level":0,"time":"2017-03-04T22:45:03+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"3R9P6XIm1cKUcSdP6E1m","remoteAddr":"","app":"cron","message":"Finished OCA\Activity\BackgroundJob\ExpireActivities job with ID 7","level":0,"time":"2017-03-04T22:45:03+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"3R9P6XIm1cKUcSdP6E1m","remoteAddr":"","app":"cron","message":"Run OCA\Files_Sharing\DeleteOrphanedSharesJob job with ID 9","level":0,"time":"2017-03-04T22:45:03+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"3R9P6XIm1cKUcSdP6E1m","remoteAddr":"","app":"cron","message":"Finished OCA\Files_Sharing\DeleteOrphanedSharesJob job with ID 9","level":0,"time":"2017-03-04T22:45:03+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"3R9P6XIm1cKUcSdP6E1m","remoteAddr":"","app":"cron","message":"Run OCA\UpdateNotification\ResetTokenBackgroundJob job with ID 18","level":0,"time":"2017-03-04T22:45:03+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"3R9P6XIm1cKUcSdP6E1m","remoteAddr":"","app":"cron","message":"Finished OCA\UpdateNotification\ResetTokenBackgroundJob job with ID 18","level":0,"time":"2017-03-04T22:45:03+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"3R9P6XIm1cKUcSdP6E1m","remoteAddr":"","app":"cron","message":"Run OCA\Files_Sharing\ExpireSharesJob job with ID 10","level":0,"time":"2017-03-04T22:45:04+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"3R9P6XIm1cKUcSdP6E1m","remoteAddr":"","app":"cron","message":"Finished OCA\Files_Sharing\ExpireSharesJob job with ID 10","level":0,"time":"2017-03-04T22:45:04+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"3R9P6XIm1cKUcSdP6E1m","remoteAddr":"","app":"cron","message":"Run OCA\Files\BackgroundJob\ScanFiles job with ID 11","level":0,"time":"2017-03-04T22:45:04+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"3R9P6XIm1cKUcSdP6E1m","remoteAddr":"","app":"OC\Files\Cache\Scanner","message":"!!! Path '' is not accessible or present !!!","level":0,"time":"2017-03-04T22:45:04+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"3R9P6XIm1cKUcSdP6E1m","remoteAddr":"","app":"cron","message":"Finished OCA\Files\BackgroundJob\ScanFiles job with ID 11","level":0,"time":"2017-03-04T22:45:07+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"3R9P6XIm1cKUcSdP6E1m","remoteAddr":"","app":"cron","message":"Run OCA\Files_Versions\BackgroundJob\ExpireVersions job with ID 3","level":0,"time":"2017-03-04T22:45:07+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"3R9P6XIm1cKUcSdP6E1m","remoteAddr":"","app":"cron","message":"Finished OCA\Files_Versions\BackgroundJob\ExpireVersions job with ID 3","level":0,"time":"2017-03-04T22:45:07+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"3R9P6XIm1cKUcSdP6E1m","remoteAddr":"","app":"cron","message":"Run OCA\DAV\CardDAV\SyncJob job with ID 180","level":0,"time":"2017-03-04T22:45:07+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"3R9P6XIm1cKUcSdP6E1m","remoteAddr":"","app":"cron","message":"Finished OCA\DAV\CardDAV\SyncJob job with ID 180","level":0,"time":"2017-03-04T22:45:07+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"3R9P6XIm1cKUcSdP6E1m","remoteAddr":"","app":"cron","message":"Run OCA\NextcloudAnnouncements\Cron\Crawler job with ID 182","level":0,"time":"2017-03-04T22:45:08+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"3R9P6XIm1cKUcSdP6E1m","remoteAddr":"","app":"cron","message":"Finished OCA\NextcloudAnnouncements\Cron\Crawler job with ID 182","level":0,"time":"2017-03-04T22:45:08+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"7PXVsgFTdDSMyAnegS3g","remoteAddr":"","app":"cli","message":"Memcache \OC\Memcache\Redis not available for local cache","level":1,"time":"2017-03-04T22:48:31+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"7PXVsgFTdDSMyAnegS3g","remoteAddr":"","app":"cli","message":"Memcache \OC\Memcache\Redis not available for distributed cache","level":1,"time":"2017-03-04T22:48:31+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"JsrVQqPmrIGoDvJfsypX","remoteAddr":"","app":"cli","message":"Memcache \OC\Memcache\Redis not available for local cache","level":1,"time":"2017-03-04T22:49:22+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"JsrVQqPmrIGoDvJfsypX","remoteAddr":"","app":"cli","message":"Memcache \OC\Memcache\Redis not available for distributed cache","level":1,"time":"2017-03-04T22:49:22+01:00","method":"--","url":"--","user":"--","version":"11.0.2.7"}
{"reqId":"ZUF18x1l/L8Ywl7R9ZWL","remoteAddr":"192.168.178.35","app":"webdav","message":"Exception: {"Message":"HTTP\/1.1 401 No 'Authorization: Basic' header found. Either the client didn't send one, or the server is misconfigured","Exception":"Sabre\\DAV\\Exception\\NotAuthenticated","Code":0,"Trace":"#0 [internal function]: Sabre\\DAV\\Auth\\Plugin->beforeMethod(Object(Sabre\\HTTP\\Request), Object(Sabre\\HTTP\\Response))\n#1 \/var\/www\/nextcloud\/3rdparty\/sabre\/event\/lib\/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\n#2 \/var\/www\/nextcloud\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php(466): Sabre\\Event\\EventEmitter->emit('beforeMethod', Array)\n#3 \/var\/www\/nextcloud\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php(254): Sabre\\DAV\\Server->invokeMethod(Object(Sabre\\HTTP\\Request), Object(Sabre\\HTTP\\Response))\n#4 \/var\/www\/nextcloud\/apps\/dav\/appinfo\/v1\/webdav.php(60): Sabre\\DAV\\Server->exec()\n#5 \/var\/www\/nextcloud\/remote.php(165): require_once('\/var\/www\/nextcl...')\n#6 {main}","File":"\/var\/www\/nextcloud\/3rdparty\/sabre\/dav\/lib\/DAV\/Auth\/Plugin.php","Line":168,"User":"USER"}","level":0,"time":"2017-03-04T22:53:18+01:00","method":"PROPFIND","url":"/remote.php/webdav/","user":"USER","version":"11.0.2.7"}

Browser log

Browser log

a) The javascript console log
Content Security Policy: Die Direktive 'frame-src' sollte nicht mehr verwendet werden. Bitte verwenden Sie stattdessen die Direktive 'child-src'.
JQMIGRATE: Migrate is installed, version 1.4.0 jquery-migrate.min.js:2:542
mutating the [[Prototype]] of an object will cause your code to run very slowly; instead create the object with the correct initial [[Prototype]] value using Object.create clipboard.js:635:49
Missing plural form in language file l10n.js:99:4
Deprecation warning: tipsy is deprecated. Use tooltip instead. js.js:2139:2
Ein iframe, der sowohl "allow-scripts" als auch "allow-same-origin" für sein "sandbox"-Attribut gesetzt hat, kann seine Sandbox entfernen. files
Warning: Deprecated API usage: PDFJS.openExternalLinksInNewWindow, please use "PDFJS.externalLinkTarget = PDFJS.LinkTarget.BLANK" instead. pdf.js:368:5
#Close is undefined. l10n.js:829:7
#Close is undefined. l10n.js:901:7
#close_label is undefined. l10n.js:829:7
#close_label is undefined. l10n.js:901:7
PDF 8ef2dfee3d6f2fd402320efbff9ca53e [1.5 pdfTeX-1.40.16 / LaTeX with hyperref package] (PDF.js: 1.4.20) viewer.js:6879:1
TypeError: child.localName is null commentmodel.js:69:43

b) The network log

<?xml version="1.0"?>
<d:multistatus xmlns:d="DAV:" xmlns:s="http://sabredav.org/ns" xmlns:cal="urn:ietf:params:xml:ns:caldav" xmlns:cs="http://calendarserver.org/ns/" xmlns:card="urn:ietf:params:xml:ns:carddav" xmlns:oc="http://owncloud.org/ns" xmlns:nc="http://nextcloud.org/ns">
 <d:response>
  <d:status>HTTP/1.1 200 OK</d:status>
  <d:href>/remote.php/dav/comments/files/8/4</d:href>
  <d:propstat>
   <d:prop>
    <oc:id>4</oc:id>
    <oc:parentId>0</oc:parentId>
    <oc:topmostParentId>0</oc:topmostParentId>
    <oc:childrenCount>0</oc:childrenCount>
    <oc:verb>comment</oc:verb>
    <oc:actorType>users</oc:actorType>
    <oc:actorId>ncadmin</oc:actorId>
    <oc:creationDateTime>Sat, 04 Mar 2017 21:38:18 GMT</oc:creationDateTime>
    <oc:latestChildDateTime/>
    <oc:objectType>files</oc:objectType>
    <oc:objectId>8</oc:objectId>
    <oc:message>further test</oc:message>
    <oc:actorDisplayName>ncadmin</oc:actorDisplayName>
    <oc:isUnread>false</oc:isUnread>
    <oc:mentions/>
   </d:prop>
   <d:status>HTTP/1.1 200 OK</d:status>
  </d:propstat>
 </d:response>
 <d:response>
  <d:status>HTTP/1.1 200 OK</d:status>
  <d:href>/remote.php/dav/comments/files/8/3</d:href>
  <d:propstat>
   <d:prop>
    <oc:id>3</oc:id>
    <oc:parentId>0</oc:parentId>
    <oc:topmostParentId>0</oc:topmostParentId>
    <oc:childrenCount>0</oc:childrenCount>
    <oc:verb>comment</oc:verb>
    <oc:actorType>users</oc:actorType>
    <oc:actorId>ncadmin</oc:actorId>
    <oc:creationDateTime>Sat, 04 Mar 2017 21:37:51 GMT</oc:creationDateTime>
    <oc:latestChildDateTime/>
    <oc:objectType>files</oc:objectType>
    <oc:objectId>8</oc:objectId>
    <oc:message>`@EXISTING_USER` test this</oc:message>
    <oc:actorDisplayName>ncadmin</oc:actorDisplayName>
    <oc:isUnread>false</oc:isUnread>
    <oc:mentions>
     <oc:mention>
      <oc:mentionType>user</oc:mentionType>
      <oc:mentionId>EXISTING_USER</oc:mentionId>
      <oc:mentionDisplayName>EXISTING_USER</oc:mentionDisplayName>
     </oc:mention>
    </oc:mentions>
   </d:prop>
   <d:status>HTTP/1.1 200 OK</d:status>
  </d:propstat>
 </d:response>
 <d:response>
  <d:status>HTTP/1.1 200 OK</d:status>
  <d:href>/remote.php/dav/comments/files/8/2</d:href>
  <d:propstat>
   <d:prop>
    <oc:id>2</oc:id>
    <oc:parentId>0</oc:parentId>
    <oc:topmostParentId>0</oc:topmostParentId>
    <oc:childrenCount>0</oc:childrenCount>
    <oc:verb>comment</oc:verb>
    <oc:actorType>users</oc:actorType>
    <oc:actorId>ncadmin</oc:actorId>
    <oc:creationDateTime>Sat, 04 Mar 2017 13:24:19 GMT</oc:creationDateTime>
    <oc:latestChildDateTime/>
    <oc:objectType>files</oc:objectType>
    <oc:objectId>8</oc:objectId>
    <oc:message>`@EXISTING_USER` look at this</oc:message>
    <oc:actorDisplayName>ncadmin</oc:actorDisplayName>
    <oc:isUnread>false</oc:isUnread>
    <oc:mentions>
     <oc:mention>
      <oc:mentionType>user</oc:mentionType>
      <oc:mentionId>EXISTING_USER</oc:mentionId>
      <oc:mentionDisplayName>EXISTING_USER</oc:mentionDisplayName>
     </oc:mention>
    </oc:mentions>
   </d:prop>
   <d:status>HTTP/1.1 200 OK</d:status>
  </d:propstat>
 </d:response>
 <d:response>
  <d:status>HTTP/1.1 200 OK</d:status>
  <d:href>/remote.php/dav/comments/files/8/1</d:href>
  <d:propstat>
   <d:prop>
    <oc:id>1</oc:id>
    <oc:parentId>0</oc:parentId>
    <oc:topmostParentId>0</oc:topmostParentId>
    <oc:childrenCount>0</oc:childrenCount>
    <oc:verb>comment</oc:verb>
    <oc:actorType>users</oc:actorType>
    <oc:actorId>ncadmin</oc:actorId>
    <oc:creationDateTime>Sat, 04 Mar 2017 13:21:20 GMT</oc:creationDateTime>
    <oc:latestChildDateTime/>
    <oc:objectType>files</oc:objectType>
    <oc:objectId>8</oc:objectId>
    <oc:message>Test</oc:message>
    <oc:actorDisplayName>ncadmin</oc:actorDisplayName>
    <oc:isUnread>false</oc:isUnread>
    <oc:mentions/>
   </d:prop>
   <d:status>HTTP/1.1 200 OK</d:status>
  </d:propstat>
 </d:response>
</d:multistatus>

[nickvergessen]

Can not reproduce, I suspect one of the JS errors should then cause this.
Can you try to disable the PDF viewer app?

[Schmuuu]

Hi @nickvergessen ,

You're great! :)
Disabling the PDF viewer app solved the problem. The comments are shown again.

While the PDF viewer app is an official app, can there be fixed something, so that I can activate it later again?

Thanks a lot!

[nickvergessen]

I can't really reproduce the issue even with that app enabled. But maybe someone from @nextcloud/javascript can help

[Schmuuu]

While you couldn't reproduce, I just enabled the PDF viewer app again and tested once more. It works perfectly fine now. So disabling and re-enabling totally solved the problem.
That's strange, but now that it works I'm happy and don't care any more.

Thank you so much for the quick help and the good advice! 👍