Another thing: I encountered some problems with the engine which were solved after restarting my PC. Once it was an input bug (one of the keyboard inputs were constantly sent) and another time it was something at the directx setup process (engine couldn't start because it was unable to initialize dx9). I belive might have something to do with windows updates requiring a restart to be fully applied.

Anyway, I don't think something like this is the problem in your case but you might want to keep it in mind.

Thanks for the info! With the keys there is also a problem if you hit a key and you still push it and then changing the window with ALT+TAB, then this key is still marked as pushed even if you don't push it anymore.

Yes, this one is a bit annoying. Though, the one I referred to still persisted even after I restarted the engine or pressed the button in question. But so far this has only happened a single time so I suspect it was something related to windows.