Cursor freezes after AI-edit tool call — resolved by removing ‘showTabs: single’

Support Bug Reports
1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

Cursor freezes immediately after the AI applies an edit to a file. The UI becomes unresponsive and must be force-quit. This happens consistently on macOS 15.6.1 (Sequoia) in the latest version of Cursor.

The developer console shows only:
WARN ToolCallEventService: Tracked tool call end - toolu_vrtx_01AF3W9nBZeKwh36MoQaJW4w

No save hooks, formatters, or extensions are active. Hardware acceleration is disabled. The issue occurs even in new workspaces and empty projects.

After extensive testing, I traced the problem to a specific user setting in the file:
~/Library/Application Support/Cursor/User/settings.json

The following line, when present, causes Cursor to hang immediately after an AI edit:

“workbench.editor.showTabs”: “single”

If this line is removed (or if the setting is changed to its default), the freeze no longer occurs.

This suggests that Cursor’s AI edit logic or editor layout refresh routines are not handling the “single” tab mode correctly.

Steps to Reproduce

  1. Add the following line to your settings.json file:
    “workbench.editor.showTabs”: “single”
  2. Restart Cursor.
  3. Ask the AI to make any change to a file (for example, “add a comment at the top”).
  4. Cursor will freeze immediately after the AI applies the edit.

Optional verification:

  1. Remove or comment out the line above.
  2. Restart Cursor.
  3. Perform the same AI edit again.
  4. Cursor no longer freezes.

Expected Behavior

Cursor should handle AI-applied edits normally regardless of tab display mode. The “single tab” mode should not trigger a freeze in the editor.

Operating System

Linux

Current Cursor Version (Menu → About Cursor → Copy)

Version: 2.2.30
VSCode Version: 1.105.1
Commit: 6b030be1a256f7464cbd98e48627a802a4831bf0
Date: 2025-12-17T06:31:05.530Z
Electron: 37.7.0
Chromium: 138.0.7204.251
Node.js: 22.20.0
V8: 13.8.258.32-electron.0
OS: Linux x64 5.15.0-164-generic

Does this stop you from using Cursor

Yes - Cursor is unusable

duplicate of Cursor freezes after AI-edit tool call — resolved by removing 'showTabs: single' , still happening

2

Hey, thanks for the report. I’ll pass it to the team.