"Show Agents Side Bar" button opens a blank block

Support Bug Reports
1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

“Show Agents Side Bar” button opens a blank block that has no content, no UI. Using Ctrl+Alt+U can close it. The issue exists since version 3.2, now it’s 3.10 but the bug still there.

Steps to Reproduce

Click on “Show Agents Side Bar” button

Screenshots / Screen Recordings

螢幕擷取畫面 2026-07-08 115213.png
螢幕擷取畫面 2026-07-08 115213.png478×439 15.1 KB
螢幕擷取畫面 2026-07-08 115247.png
螢幕擷取畫面 2026-07-08 115247.png817×1363 22.6 KB

Operating System

Windows 10/11

Version Information

Version: 3.10.17 (system setup)
VS Code Extension API: 1.125.0
Commit: c89f45b831621cdc5e951694db44fecd8fab1150
Date: 2026-07-05T06:39:45.228Z
Layout: IDE
Build Type: Stable
Release Track: Default
Electron: 40.10.3
Chromium: 144.0.7559.236
Node.js: 24.15.0
V8: 14.4.258.32-electron.0
xterm.js: 6.1.0-beta.256
OS: Windows_NT x64 10.0.26100

Does this stop you from using Cursor

No - Cursor works, but with this issue

6

Hi Tim,

This looks like a genuine bug on our side, not something in your setup: the Agents Side Bar is opening blank instead of showing your agents list. It’s something we’ve seen before and are actively working on in this part of the IDE.

A couple of things in the meantime:

  • As you found, Ctrl+Alt+U collapses the panel.
  • To try to get it rendering again, move your Primary Side Bar to the other side and back: right-click the Activity Bar (the icon strip on the far side) and choose Move Primary Side Bar Left, then move it back with Move Primary Side Bar Right. That’s forced the panel to redraw for others who hit the same blank state.

If it’s still blank after that, could you grab a bit of diagnostic info so I can pin down the cause on your machine? Open Help > Toggle Developer Tools > Console, click “Show Agents Side Bar” so the panel goes blank, and paste any red error lines here (a short screen recording of the toggle helps too).

Keeping it collapsed with Ctrl+Alt+U is completely fine in the meantime, and it won’t affect anything else in Cursor. Once I can see what’s happening on your side, I’ll get it tracked with the team.

7

Hi Mohit,

Moving Primary Side Bar does not resolve the issue.

This is the only Warning message I found in console that seems related to UI, but it keeps appearing for dozens of times

WARN Unexpected error checking unified sidebar visibility: Error: Index out of bounds
    at Dj.isViewVisible (workbench.desktop.main.js:7744:106008)
    at _jn.isChildVisible (workbench.desktop.main.js:17281:123784)
    at o8m.isViewVisible (workbench.desktop.main.js:17281:138354)
    at yjn.isViewVisible (workbench.desktop.main.js:17281:146039)
    at WXb.isVisible (workbench.desktop.main.js:21980:94696)
    at WXb.getMaximumEditorDimensions (workbench.desktop.main.js:21980:96858)
    at get minimumWidth (workbench.desktop.main.js:17393:63734)
    at get minimumWidth (workbench.desktop.main.js:17281:128981)
    at get minimumOrthogonalSize (workbench.desktop.main.js:17281:129798)
    at workbench.desktop.main.js:17281:119697

Thanks,
Tim