CILogon Remember Me Checkbox not working

[culbert]

Checkbox that tells cilogon to redirect users to their preferred IdP automatically does not work.
keepidp cookie should get set and does not

TEST
logon to cilogon directly, watch cookie get set correctly in .cilogon.org realm
logon to portal.mghpcc.org cookie does not get set

Suspect dropping POST content in some redirect or multiple posts where set in first but lost in subsequent (i.e. gets set on first pass then unset on second).