Kernel Selection doesn't work

Support Bug Reports
23

same :smiley:

24

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

Right before pressing install update my interactive jupyter notebook (ctrl + shift + enter) worked fine. Now it’s throwing a:

/c:/Users/Lukas/AppData/Roaming/Cursor/User/globalStorage/ms-toolsai.jupyter/version-2025.2.0/jupyter/runtime contains invalid WIN32 path characters.

What I’ve tried

  • Restarting Cursor
  • Deleting venv and recreating
  • Downgrading the jupyter extension to 2025.2.0

Steps to Reproduce

Download jupter extension from ms-toolsai. Activate interactive window in settings.

Open an interactive window

Operating System

Windows 10/11

Current Cursor Version (Menu → About Cursor → Copy)

Version: 2.0.54
Windows

Does this stop you from using Cursor

No - Cursor works, but with this issue

1 Like
25

I got the same issue and spent the whole day uninstall - reinstall again and again, it doesn’t work, I’m frustrating now. Maybe I’ll try downgrade it tmr

2 Likes
26

I’ve been forced to downgrade cursor by this too.

27

Same issue, so trying to bump the thread

28

Same issue, reinstalling to see if that works…

29

same

30

same. switching over to VSCode for now.

31

same

32

Same!!! I changed back to VStudio

34

Same issue, plz fix asap

35

So bad auto update, jupyter core not work, run by cell cannot be accessed now.

36

Same issue here … spend a lot of time trying to fix it as I thought it was something I had done, but should have looked here to find out immediately the later version of cursor seem to cause the issue.

1 Like
37

Downgrading to the previous version fixed the issue …

38

same. but my current walkaround just install the previous version 1.7
all the extension are same as before and jupyter works fine
but my colleagues are not facing the same problems as us. that’s a bit strange

39

I have the same problem,too.

40

I have the same problem. I cannot select any of my Kernels.

41

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

Sinde today’s update (Nov 4th, 2025) whenever I use Jupyter notebook, I cannot select any kernel: it lists available environments, just selecting them does nothing. tl;dr it worked 5 minutes before update. It still works on VS Code, so it seems to be Cursor-specific.

Steps to Reproduce

  1. Open a notebook
  2. Click “Select kernel”
  3. Click on any kernel

Expected Behavior

Kernel selected so that I can run the notebook.

Operating System

Windows 10/11

Current Cursor Version (Menu → About Cursor → Copy)

Version: 2.0.54 (system setup)
VSCode Version: 1.99.3
Commit: 7a31bffd467aa2d9adfda69076eb924e9062cb20
Date: 2025-11-03T22:40:44.657Z
Electron: 37.7.0
Chromium: 138.0.7204.251
Node.js: 22.20.0
V8: 13.8.258.32-electron.0
OS: Windows_NT x64 10.0.26100

Does this stop you from using Cursor

No - Cursor works, but with this issue

2 Likes
42

version 2.0.60 still has this problem??? What have you updated?

2 Likes
43

It’s not working for me either.