I have played through what I imagine to be about half the game, and had no issues with the mouse, then I get to the part where you meet the boy who is crying over his dead uncle, and after that the mouse had had EXTREME deceleration. Like I move the mouse and the look does not stop when I stop the mouse. For kicks, I turned up the sensitivity a bit and if I give the mouse a quick flick, the look will do a full 360 after I have stopped moving the mouse. It's not lag, my framerate is high (no specific number, but high enough that AVSYNC keeps the screen from tearing much. Anyone else had this issue? Is there a known fix? All my other games are fine, and like I said, Metro was fine up until this cutscene.