Cannot run or crouch anymore

Nineroni

I play on PC (steam) and use keyboard and mouse for my gameplay. Since the update I'm not able to run or crouch anymore. My keyboard's just fine and works completely normal. No other game has such problems. I tried everything, but nothing's working. I cannot hide or run away from the killer and it's ever since the updates. Every single round is the same and I tried many so far.

Edit: Found the problem! Got a nice hint and now it works again!