[Bug] SHOW-STOPPER: Claude Code 2.0.1 CLI Terminal UI Rendering Corrupted + Scrolling Instability + Completely Unusable

[dimension-zero]

Bug Description

Claude Code CLI v2.0.1 exhibits severe display corruption that renders the application unusable. Every character typed causes the display to scroll upward and/or status line to scroll right-wards; and terminal output becomes misformatted and corrupted.

Environment

Version: Claude Code CLI v2.0.1
OS: Reproducible on both macOS and Windows
API Status: Claude works normally in browser and via API with same credentials

Steps to Reproduce

• Launch Claude Code CLI v2.0.1
• Begin typing any character input
• Observe display behavior

Expected Behavior

• Terminal display should remain stable with properly formatted text as characters are typed.
• Claude Code narrative should remain displayed above prompt box

Actual Behavior

• Display scrolls upward with each character input
• and/or status Line scrolls rightward with every character

* Terminal output becomes misformatted and corrupted * Claude Code narrative stacks vertically with every update * UI becomes unusable despite Claude functionality working correctly (browser, API, same account)

Additional Context

• This appears to be a pure UI/display rendering issue
• Claude backend functionality is unaffected (confirmed by normal operation in browser and via API)
• Issue consistent across Windows and macOS

Impact

Severity: Critical - Application is completely unusable in its current stateRetry

Environment Info

• Platform: darwin
• Terminal: Apple_Terminal
• Version: 2.0.1
• Feedback ID: 11bd2495-b360-4efb-ad28-4934daa9a1d3

[dimension-zero]

[Bokazan]

I have the issue that my mouse wheel only scrolls through the command history and not the claude code output window. I tried to use shift, arrow up and down, shift arraws up and down and page up and page down. all only scroll through the chat history. Not sure if that is related to this bug. Also enlarging the terminal window doesn't help. That only renders the window in the same way as mentioned above.

I'm running claude code in vscode on windows 11.

[timstoop]

I have the same issue with wezterm on Linux Mint. The terminal state seems to persist through to the actual shell after exiting Claude Code. I need to open a completely new tab/window to get rid of the issue and not use claude --continue either.

[dimension-zero]

Seems this is fixed in 2.0.5 and 2.0.8
Nice work @bcherny @catherinewu if it's you people behind it.

[timstoop]

I have this issue in 2.0.5, actually. Just sporadic, I cannot put my finger on when it happens and what triggers it.