Where does the bug appear (feature/product)? Cursor IDE Describe the Bug Hi Cursor Team, I recently upgraded to Cursor 3 (latest version), and immediately after the update, I started experiencing critical issues with core features. The Problem: Jupyter Notebooks: I am unable to open any .ipynb f…

I tried cursor --disable-extensions , not work

Hey, thanks for the report. From the screenshots it looks like the extension host isn’t starting at all. The notebook is empty, and the AI panel gets stuck on “Waiting for extension host” and then times out. The project is simple too, so it doesn’t look like a load issue. Since --disable-extensions …

I also had the same issue and it is working for me. I was in ubuntu 24.04. So I had the change the path based on ubuntu. Just writing, if anyone with ubuntu can see the direct path. So the steps become: Clear cache: Delete ~/.config/Cursor/CachedExtensions and ~/.config/Cursor/CachedExtensionVSIX…

I have the same problem on Mac. Moreover, terminal doesn’t load too. Console output: [image] Workaround: close all Jupyter notebooks and restart Cursor. Wait before all extensions finish loading and terminal appears ready. Open the notebook

@Arseni_Zemskov I see a screenshot with the ms-toolsai.jupyter error. The extension is trying to use API proposals that aren’t in the current product.json. This is part of the same extension host issue after updating to Cursor 3. Your workaround (close all notebooks, restart, wait for extensions to…

[Bug] Jupyter Notebooks & AI Panel broken after upgrading to Cursor 3

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Shaoyang_Xue (Shaoyang Xue) April 10, 2026, 10:28am 3

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BUG: Waiting for extension host Bug Reports chat , crashes	6	100	April 10, 2026
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[Bug] Jupyter Notebooks & AI Panel broken after upgrading to Cursor 3

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