Cursor Tab completions in Jupyter notebooks stopped working again

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1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

Cursor Tab completions in Jupyter notebooks stopped working again since today.
Works fine in .py files, but doesn’t work in jupyter notebooks, even if I create a new clean one.

The very same issue happened earlier: Cursor Tab in Jupyter notebook sometimes doesn't work

Steps to Reproduce

Open Jupyter notebook, try writing any code.

Expected Behavior

Tab completions working and showing code suggestions

Operating System

MacOS

Version Information

Version: 2.6.12
Commit: 1917e900a0c4b0111dc7975777cfff60853059d0
Date: 2026-03-04T21:41:18.914Z
Browser: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Cursor/2.6.12 Chrome/142.0.7444.265 Electron/39.6.0 Safari/537.36

For AI issues: which model did you use?

Tab

Additional Information

What I tried:

  1. Reloading cursor
  2. Reinstalling/downgrading Jupyter extension
  3. Reinstalling downgrading cursor
  4. Resetting cursor settings

Quick checks:

  1. Status bar, open a .ipynb file and look at the bottom-right corner. Does it show Cursor Tab is enabled/active for notebooks?
  2. Cell language, make sure the notebook cell is set to Markdown or Python as needed, not Plain Text. If Plain Text is selected, Tab suggestions might be disabled by your global settings.
  3. Jupyter extension, confirm the Jupyter extension is installed and active.
  1. Active and enabled
  2. Cell language - Python, Kernel active
  3. Installed and active

Does this stop you from using Cursor

Yes - Cursor is unusable

4 Likes
3

Same. I feel recent updates are quite unstable.

2 Likes
4

Hey, this looks like a regression of a bug we already fixed. The exact same thing happened in October 2025, and we fixed it soon after.

Last time the fix was on the server side, so you didn’t need a new Cursor version. We’re looking into it again now.

I’ll update this thread once we have more news.

3 Likes
6

Same issue

7

Same :confused:

8

same issue, no auto-sugguestion in jupyter notebook cells. The feature was working in exactly the same notebook files at least two days ago.

2 Likes
9

Same, since 2 days not working. On the late version of cursor right now; if its relavant - also using the pro plan.

Apart from the cursor tab copilot not working, the edit suggestion is also showing to delete a couple of lines anywhere I place the cursor at; which doesnt seem proper.

1 Like
10

the same, on windows

14

I’m having the same issue as well - I’m a paying customer

15

Seems to be working now.

@deanrie Thanks for assistance!

1 Like
19

Hey @artemuk, @hdry567hrt, @hyeon0819 and @smao!

This issue has been fixed in a recent Cursor update. Updating to the latest version should resolve this. If you’re still experiencing this on the latest version of Cursor, please raise a new thread and we’ll take a look.