I'm currently getting quite a weird bug on my copy of the PC version.
Basically, whenever I boot the game from Steam, proceed to load my save and enter certain specific rooms, the speed of the game turns into slow motion and stays like that as long as I remain within the first camera angle of that room.
The two rooms where I was able to reproduce this almost constantly are the corridor after the dining room, where you meet the first zombie, and the room where you get the 1F Map.
What makes it even weirder is that if I move towards a camera change or alt-tab out and back into the game, it immediately goes back to smooth and constant 60fps.
I really don't get what's causing this at the moment. Any possible clues?