Edit: reinstall fixed it, and preferences unaffected as Myxir explained. thanks
After playing a game (or even just joining a lobby), when I try to play another one, it says FA is already running, and no more than 1 instance is allowed. This happens even though I left the previous game normally through the score screen. There is no instance of FA in the task manager.
Screenshots of error message:
Sometimes is dialogue appears (and won't go away unless I tab into another window)
Is reinstalling FAF the only way to fix it? I'd like to avoid redownloading and reconfiguring all UI mods and hotkeys.