[Bug] Jupyter Notebooks & AI Panel broken after upgrading to Cursor 3

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@Sergii-L Unfortunately, chats and agent history from Cursor 3 aren’t compatible with version 2.6.22. They use different state.vscdb formats. If you renamed the %APPDATA%\Cursor folder to Cursor_backup, your v3 data is still there in Cursor_backup. You can switch back to Cursor 3 and rename Cursor_backup back to Cursor, and your chats should show up.

Instead of a full rollback, try the cursor-socket symlink fix that helped other Windows users:

  • Open PowerShell as admin
  • Check the folder contents:
    dir "$env:LOCALAPPDATA\Programs\cursor\resources\app\extensions\cursor-socket"
  • If you see dist\ but not out\, create a symlink:
    cd "$env:LOCALAPPDATA\Programs\cursor\resources\app\extensions\cursor-socket"
New-Item -ItemType SymbolicLink -Name "out" -Target "dist"
  • Restart Cursor.

If you’re using the system setup, the path will be C:\Program Files\cursor\... instead of $env:LOCALAPPDATA\Programs\cursor\....