Not sure if this has been reported yet, but within the first 30 seconds of starting the campaign, the game created a bug that made it impossible to move except for jumping and crouching. When I closed the game, I found that my arrow keys and WASD were somehow reversed outside of the game too. Not sure how this happened, as I was only running and tripping in game before this occurred. Fixed by unplugging keyboard and plugging it back in. Haven't replicated it since.