Hi Eugen , glad the manual reinstall got you working again.
The second problem (the “new window for parallel agents” failing when it opens) is a known issue we’re already tracking. The Agents Window can fail to render if it opens before some of Cursor’s settings have finished loading in the background - which matches exactly what you saw (“it doesn’t recognize the configuration”). Your last point is spot on: this should degrade gracefully instead of crashing, and that’s precisely the fix our team has in progress. I don’t have a release date to share yet.
In the meantime, the quickest workaround is to reload that window after it opens: Command Palette (Cmd+Shift+P) → Developer: Reload Window (or just close and reopen the Agents Window). Once the app has fully warmed up the settings are cached, so the window renders normally - the same reason your reinstall/restart cleared the earlier startup crash.
If it still crashes every time even after a reload, grab the exact error text from the panel (there’s a “Copy error” button) and paste it here - that lets me confirm it’s the same issue and not a separate one.