Camera Focus Issue

[CodedLyoko]

I recently purchased Amnesia: The Dark Descent from Steam as part of their winter sale, however my excitement was extinguished when attempting to play a Custom Story: All I could do was stand helpless as my character simply looked at the ceiling and spun around forever despite my mouse inputs.

Now I have tried EVERYTHING: I reinstalled the game, rebuilt the game data, created a different profile, restarted my laptop, changed the resolution, tried going into Windowed Mode, unplugged my mouse (the only USB device plugged in), and attempted to play the included Story and other Custom Stories but encountered the same problem after each attempt at fixing it.

If anyone has a solution, I would be extremely grateful, as this game is the only one I've been excited about getting (a few years late, granted) in a very long time and I would like to enjoy it.