Hey, thanks for the report. There are two separate issues here. I’ll help with both.
Login issue main blocker
Auth is passing on the server side, but the app isn’t picking up the callback. Since you reinstalled with a different version, the cursor:// protocol handler likely needs to be re-registered.
Try a clean reinstall on Mac:
- Fully quit Cursor
- Delete leftover data, make a backup first:
rm -rf ~/Library/Application\ Support/Cursor rm -rf ~/.cursor - Download the latest version from Cursor · Download
- Install and try logging in again
If that still doesn’t work, once you’re in the app, open Settings Cmd+,, search for proxy support, and change Http: Proxy Support from override to on, then restart. This has fixed similar login loops: Cursor Desktop App Does Not Sign-In After Signing In From Web
Also check if you’re using a VPN, proxy, or firewall. Try disabling them temporarily.
Waiting for extension host on Ubuntu
This is a known issue the team is tracking. Once you can log in, try:
- Settings > search
HTTP compatibility mode> switch to HTTP/1.1 Ctrl+Shift+P> Developer: Reload with Extensions Disabled
More context in these threads:
Let me know how it goes.