[Completely Unusable] - C# Cursor Freezes and Crashes on Launch

Bug Reports
1

Hi Cursor team,

Cursor has become completely unusable when working with C# after I clicked the in-app update notification. About 5 seconds after launching a C# workspace, the app freezes and crashes every single time. This prevents me from using Cursor at all for my primary development work.

Interestingly, I confirmed that the issue does not occur when opening Python projects — only C# triggers the crash so far.

Because of this, I’ve been forced to switch to VS Code until this is fixed.

:repeat_button: Steps to Reproduce

  1. Open Cursor (post-update)
  2. Wait ~5 seconds
  3. App freezes and becomes unresponsive
  4. Shortly after, it crashes

:laptop: System Info

  • Cursor Version: 0.50.4 (user setup)
  • VSCode Version: 1.96.2
  • Electron: 34.3.4
  • Chromium: 132.0.6834.210
  • Node.js: 20.18.3
  • V8: 13.2.152.41-electron.0
  • OS: Windows 11 Home 24H2 – Build 26100.3775
  • CPU: Intel Core i9-14900HX
  • RAM: 96 GB

:camera: Screenshots

:prohibited: Impact

Yes – Cursor is currently completely unusable.

Let me know if there’s any log I can upload to help debug. Thanks.

2

Does this happen to you on every C# project, or just this specific one?

Are you able to look at your console (CTRL+SHIFT+P to open the Command Palette → Developer: Toggle Developer Tools) and see if anything appears before the crash?

Could you also open the Task Manager and see what processes spawn when you open Cursor, if anything looks out of the ordinary?

Finally, it might be related to some extension you have installed that interacts poorly with the new update. Could you open the Command Palette and perform an extension bisect, and let me know if it’s one of the extensions? Help → Start Extension Bisect

3

I should specify this is for a Unity C#. I don’t have another C# project to use it on but I can try one. I’ve also disabled all C# and Unity extensions, and it still crashes.

  1. In the developer console I’m not sure if this error is the cause of it:
    image
    image970×732 56.1 KB
  2. Everything looks pretty normal in the task manager:
    image
    image878×531 32 KB

    3.I did the extension biesct and It said “No extension can be found, it may be a problem with cursor”
    image
    image975×670 52.8 KB
4

I reinstalled cursor to 0.49.6 so I can continue to work. I will not be updating for a long time to avoid this happening again.

5

Sent you a DM so I can keep looking into your issue!

6

Yeah v50+ became very hard to use. It freezes consistently now after about 10 messages.

7

Almost every message now. This is probably a deadend for Cursor. Overload the UI, memory leaks out of their control, etc.