Latest version 2.0.64 is still broken 
. Thanks for you excellent work!
Guess they are vibe coding these versions now
Where does the bug appear (feature/product)?
Cursor IDE
Describe the Bug
After update I can no longer select my kernel in ipython notebook. reinstalling all iphython and python extensions did not help. Everything works find with VScode or pure ipython. I see the kernel name, click on it, but it is not selected
Steps to Reproduce
try to select a kernel in ipython notebook
Expected Behavior
kernel should be selected
Operating System
Windows 10/11
Current Cursor Version (Menu â About Cursor â Copy)
Version: 2.0.60 (user setup)
VSCode Version: 1.99.3
Does this stop you from using Cursor
Yes - Cursor is unusable
Still doesnât work
Version: 2.0.64 (user setup)
VSCode Version: 1.99.3
Commit: 25412918da7e74b2686b25d62da1f01cfcd27680
Date: 2025-11-06T04:35:14.424Z
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
And here I am thinking I was alone. Using the latest update (version 2.0.64) and the issue isnât resolved yet. This is disappointing! The workaround (providing a Jupyter serverâs URL) worked for me.
Can confirm after update 2.0.64 (user setup) on Windows problem still persists, selecting a kernel in the Select Kernel button on the top right, on an .venv (Recommended) the button reverts back to Select Kernel and cells donât run.
.venv was created with uv, initially added only ipykernel, after the problems of notebooks not running in cursor, I added jupyterlab to the same environment. Problem persists.
Env is ok since âuv run jupyter labâ creates a working jupyter lab environment.
Running notebooks in this env in cursor doesnât work.
Restarting cursor doesnât help. Recreating the env by removing the .venv directory followed by âuv syncâ, recreates the env, and works in jupyter lab, but not in cursor.
I use notebooks daily so this is a huge problem for me since running them in jupyter lab prevents me from having access to all the AI features Iâm paying for.
EDITED: Also uninstalling and then re-installing cursor (without clearing anything) did not help running the notebooks, BUT adding the Jupyter Lab url with the correct token did work for me.
Please fix this issue ASAP. Thanks for an otherwise excellent product.
âââââââââââââââââââââââââââââââââââ
Version: 2.0.64 (user setup)
VSCode Version: 1.99.3
Commit: 25412918da7e74b2686b25d62da1f01cfcd27680
Date: 2025-11-06T04:35:14.424Z
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
same issue!
yes, like 2.0.64
This workaround did work for me, thank you so much!
But, definitely better to use the raised jupyter console on browser without selecting kernel, i guessâŚ
Wow! cursor team didnât fix this in the latest release as well 
. Is it too hard to figure out the right prompt??
Unfortunately I was working in a pretty big datanalysis repo and take much time to figure the cursor was the problem. I installed my older IDE and go on.
Actually version 2.0.64 and still not working. I sincerely motivated to cancel my plan because this.
does this issue still persist ? what is the status as of 6th NOV ?
how to do this ?
Same issue.
Same issue, same error message, running Cursor 2.0.64 on Win11.
Error: /c:/Users/~/AppData/Roaming/Cursor/User/globalStorage/ms-toolsai.jupyter/version-2025.3.0/jupyter/kernels contains invalid WIN32 path characters.
Here´s a workaround. You can run a local Jupyter server:
python -m jupyter notebook --no-browser --port=8888
Copy one of the displayed server urls, which looks like this:
http(s)://127.0.0.1:8888/tree?token=7f031c5c2c2d20âŚ
Then open your notebook with Cursor, and instead of picking a kernel, select âexisting Jupyter serverâ and paste that url.
same issue here, I think it was a me issue when come to the first place until I found this forum, wasted hours talking to AI trying to fixed it
It keep trying to looking at a wrong path, itâs not jupyter extension problem, itâs cursor itself, (I had downgrade my jupyter version, still not working)
same issue. downgrade 2024.11.0
but not solved
no Jupyter, go downgrade âCursorâ.
For nowďźthe only way can solve this problem is just start jupyter from Terminal them copy the url to connect the kernelďźbecause there is a weird â/â before the python path when the jupyter connect kernelďźit cause jupyter can find the python environment but cannot connect
Same issue here.
This workaround works: Kernel Selection doesn't work - #102 by AlexGreva