Re: Weird bug (PC) gun wont fire but only with controller on first level of campaign

From what I recall, in the brief time I tried using a controller, the game was getting confused as to whether I was playing with mouse/keyboard or controller. So, if you're hellbent on using a controller on PC, you might try unplugging the mouse and/or keyboard.

In general, my recommendation is what you might expect - stick with mouse/keyboard if you're playing on PC.