Cursor AI Not Working After Update? Here’s How I Fixed It

Meta Description: Cursor AI broke after your last update? I walk through the exact diagnostic steps and fixes that got my AI features, indexing, and extensions working again

I updated Cursor on a Tuesday morning, mid-sprint, expecting the usual “restart and you’re good” experience. Instead, the AI chat panel sat there spinning, autocomplete stopped suggesting anything, and the status bar quietly told me the extension host had crashed. I lost about an hour of a deadline day figuring out what was actually broken versus what just looked broken.

Since then I’ve had this happen on three separate updates across two machines (one Windows, one Mac), and I’ve picked apart enough of these failures to know the update process itself isn’t usually the real problem — it’s what the update leaves behind. In this guide I’m walking through the exact diagnostic order I now use, the fixes that actually worked, and the ones that wasted my time so you can skip them.

This isn’t a copy-paste of Cursor’s own troubleshooting page. It’s what I actually did, in the order I did it, including the dead ends.

Why Cursor AI Breaks After an Update

Cursor is built on top of VS Code’s open-source core (Code – OSS), with its own AI layer bolted on for chat, autocomplete, and codebase indexing. That combination means an update has to successfully patch two systems at once: the editor shell and the AI service layer that talks to the underlying models. When one of those two layers updates cleanly and the other doesn’t, you get exactly the kind of half-broken state I ran into.

In my experience, the failures cluster into a handful of root causes:

Stale extension cache — the old version’s cached extension host process doesn’t get replaced cleanly, so Cursor is technically running new UI code against old backend state.
Interrupted or partial download — especially common on slower connections or if the app auto-updates while your laptop goes to sleep mid-download.
Authentication token invalidation — Cursor ties your AI features to your account session, and a version bump occasionally forces a silent re-auth that fails quietly instead of prompting you.
Conflicting VS Code extensions — extensions built for the previous Cursor/VS Code API version can crash the extension host on the new version.
Local index corruption — Cursor’s codebase indexing (the feature that lets it answer questions about your whole repo) stores an embeddings cache locally, and that cache can become incompatible with a new version.
Node/Electron runtime mismatch — on Linux especially, I’ve seen the bundled runtime fail to replace an older one if the update installer didn’t have proper permissions.

None of these are exotic. They’re the same class of problems every Electron-based dev tool runs into (VS Code, Slack, and Postman have all bitten me the same way at some point).

Step 1: Confirm It’s Actually the AI Layer, Not the Editor

Before touching any settings, I separate two failure modes, because the fix is completely different depending on which one you have:

The editor itself is unstable (freezing, crashing, UI not rendering) — this is a Code-OSS/Electron problem.
The editor works fine, but AI features (chat, autocomplete, Ctrl+K, codebase indexing) don’t respond — this is the AI service layer.

To check, open a plain file, type normally, save, and use a couple of standard editor commands (Cmd/Ctrl+Shift+P for the command palette, file search). If all of that works and only the AI-specific features are broken, skip straight to Step 3 — you don’t need to reinstall the whole app.

If the editor itself is sluggish or crashing outright, start with Step 2.

Step 2: Check the Extension Host and Developer Console

Cursor runs AI features inside the same extension host process model VS Code uses. When it crashes, there’s almost always a visible signal.

What I check first:

Open the Command Palette → Developer: Show Running Extensions. If you see a red warning icon next to any extension, or the Cursor AI extension itself shows as “not responding,” that’s your culprit.
Open Help > Toggle Developer Tools (or Developer: Toggle Developer Tools from the command palette) and check the Console tab for red error output. You’re looking for anything mentioning ECONNREFUSED, 401, extension host terminated unexpectedly, or a stack trace pointing at the Cursor AI extension specifically.

In my case, the console showed the extension host restarting in a loop, which pointed me straight at a corrupted cache rather than a network issue.

Pro tip: Screenshot or copy the console error before you do anything else. If none of the fixes below work and you end up filing a support ticket, this is the first thing they’ll ask for.

Step 3: Clear the Extension and AI Cache

This fixed it for me on two out of three occurrences, and it’s the fix I now try first every time.

Fully quit Cursor (not just close the window — quit the process, since Electron apps love to linger in the background) and clear the cache directories:

macOS:

# Quit Cursor completely first
pkill -f Cursor

# Clear cache and cached extension state
rm -rf ~/Library/Application\ Support/Cursor/Cache
rm -rf ~/Library/Application\ Support/Cursor/CachedData
rm -rf ~/Library/Application\ Support/Cursor/User/workspaceStorage

Windows (PowerShell):

# Make sure Cursor.exe is not running in Task Manager first
Remove-Item -Recurse -Force "$env:APPDATA\Cursor\Cache"
Remove-Item -Recurse -Force "$env:APPDATA\Cursor\CachedData"
Remove-Item -Recurse -Force "$env:APPDATA\Cursor\User\workspaceStorage"

Linux:

pkill -f cursor

rm -rf ~/.config/Cursor/Cache
rm -rf ~/.config/Cursor/CachedData
rm -rf ~/.config/Cursor/User/workspaceStorage

workspaceStorage specifically holds the local codebase index. Deleting it means Cursor will re-index your open projects the next time you launch it, which can take a few minutes on larger repos — that’s expected and not a sign something’s still broken.

After clearing these, relaunch Cursor and give it a minute before testing AI chat again. The extension host needs to spin back up and the AI layer needs to re-establish its connection.

Step 4: Re-Authenticate Manually

If clearing the cache didn’t fix it, the next most common cause is a silently expired session. Cursor doesn’t always surface a clear “please log in again” prompt when this happens — sometimes AI chat just returns empty responses or spins indefinitely.

Open Settings (Cmd/Ctrl+,) and go to the Account section.
Sign out completely, fully quit the app, then relaunch and sign back in.
Confirm your subscription/plan status shows correctly after logging back in — I’ve seen cases where a mid-update auth hiccup temporarily shows a free-tier account even for paid users, which limits model access.

This was the actual fix the second time this happened to me — the cache clear alone didn’t do it, but signing out and back in did.

Step 5: Check for Extension Conflicts

If you have VS Code extensions installed on top of Cursor’s built-in AI features (common ones I’ve seen cause trouble: certain linters, Vim emulation plugins, and some Git GUI extensions), a version bump can break compatibility.

Test this by launching Cursor in a clean state with extensions disabled:

# macOS/Linux
cursor --disable-extensions

# Windows (from the install directory or if cursor is on PATH)
cursor.exe --disable-extensions

If AI features work fine with extensions disabled, re-enable them one at a time (or in small batches) to isolate the conflicting one. I found a Vim keybinding extension was the culprit once — it was intercepting keystrokes that Cursor’s inline AI suggestions needed to register.

Step 6: Full Clean Reinstall

If none of the above works, a clean reinstall is the reliable fallback. The key word is clean — just running the installer over the existing app often doesn’t fix corrupted runtime files.

Uninstall Cursor through your OS’s standard uninstaller (Add/Remove Programs on Windows, drag to Trash on Mac, your package manager on Linux).
Manually delete any remaining config folders (the same ~/Library/Application Support/Cursor, %APPDATA%\Cursor, or ~/.config/Cursor paths from Step 3) — uninstallers frequently leave these behind on purpose to preserve settings, but that’s exactly what you don’t want here.
Download the latest installer directly from Cursor’s official site rather than trusting an in-app auto-update.
Install fresh, then sign in.

This is disruptive because you’ll lose local settings and keybindings unless you’ve backed up your settings.json, so I only recommend it after Steps 3–5 have failed.

Step 7: Roll Back to the Previous Version

If the newest release is genuinely buggy (this does happen — I’ve seen it on release notes threads where multiple users report the same symptom right after a version bump), rolling back is a legitimate short-term fix while you wait for a patch.

Cursor keeps previous version installers available for direct download. The process:

Uninstall the current version.
Download the specific previous version installer.
Install it, and — this matters — disable auto-update temporarily in Settings so it doesn’t immediately re-download the broken version.

I only recommend this as a last resort since you’ll miss whatever the new version actually fixed, but when I’m mid-deadline, a working older version beats a broken new one every time.

Common Error Messages and What They Actually Mean

Error / Symptom	Likely Cause	Fix
Chat panel spins indefinitely, no response	Auth token expired silently	Sign out and back in (Step 4)
“Extension host terminated unexpectedly”	Corrupted cache or conflicting extension	Clear cache (Step 3), then test extensions (Step 5)
Autocomplete stopped suggesting anything	Extension conflict or indexing failure	Disable extensions, rebuild index
Indexing stuck at a fixed percentage	Corrupted local embeddings cache	Delete `workspaceStorage`, re-index
AI responds but ignores codebase context	Index not finished or failed silently	Manually trigger re-index from command palette
App won’t launch at all post-update	Failed/partial download or corrupted runtime	Clean reinstall (Step 6)
Works on one project, not another	Project-specific `.cursor` config conflict	Check for a stale `.cursorignore` or workspace settings override

Preventing This on Future Updates

A few habits that have saved me from repeating this whole process:

Turn off silent auto-update if you’re mid-project on a deadline, and update deliberately when you have time to troubleshoot if something breaks.
Back up settings.json and keybindings periodically — it makes a clean reinstall far less painful.
Check the changelog before updating if you rely heavily on a specific AI feature (like a particular model integration) — occasionally a release note will flag a known regression.
Don’t update mid-deploy or mid-sprint if you can avoid it. I now update on Friday afternoons instead of Monday mornings.

Cursor AI Troubleshooting Checklist

[ ] Confirmed whether it’s the editor or the AI layer that’s broken
[ ] Checked Developer Tools console for explicit errors
[ ] Checked Running Extensions panel for crashed extensions
[ ] Cleared Cache, CachedData, and workspaceStorage folders
[ ] Fully quit and relaunched (not just closed the window)
[ ] Signed out and back into the Cursor account
[ ] Tested with --disable-extensions
[ ] Attempted a clean reinstall if all else failed
[ ] Considered a temporary rollback if the new version is clearly buggy

Frequently Asked Questions

Why did Cursor AI stop working after I updated it? Most of the time it’s a leftover cache from the old version, an expired auth session that didn’t prompt a re-login, or a VS Code extension that’s incompatible with the new release. It’s rarely the update package itself that’s broken.

How do I clear Cursor’s cache? Fully quit the app, then delete the Cache, CachedData, and workspaceStorage folders from Cursor’s application support directory (paths differ by OS — see Step 3 above). Relaunch and let it rebuild.

Why is Cursor AI chat spinning forever without responding? This usually points to an authentication issue rather than a network outage. Sign out of your account fully, quit the app, and sign back in.

Can I downgrade Cursor to an older version? Yes, Cursor’s official site hosts previous version installers. Uninstall the current version, install the older one, and disable auto-update so it doesn’t overwrite your rollback.

Why is Cursor’s codebase indexing stuck? The local embeddings cache in workspaceStorage can become corrupted or incompatible after an update. Delete that folder and trigger a re-index from the command palette.

Does disabling extensions actually help with AI features specifically? Yes — Cursor’s AI layer runs inside the same extension host process as regular VS Code extensions. A crashing extension can take the AI features down with it even if the extension has nothing to do with AI.

Is this problem specific to Cursor, or common to all AI code editors? It’s common to any Electron/VS Code-fork-based tool with a background service layer — the same class of issue shows up in other forks and even in VS Code itself with certain extensions. Cursor’s AI layer just adds one more moving part that can get out of sync during an update.

Final Thoughts

If Cursor AI stops working right after an update, don’t jump straight to a full reinstall — in my experience, clearing the cache and re-authenticating solves the vast majority of cases in under five minutes. Save the clean reinstall and rollback for when those don’t work, and build in the habit of checking the Developer Tools console early; it almost always tells you exactly which layer broke.

If you found this useful, I’ve got more deep-dive troubleshooting guides for AI dev tools, DevOps pipelines, and cloud infrastructure over on SpiritCode.blog — worth a browse if you’re the type who’d rather understand the fix than just apply it.