I seem to be having a major problem atm. Basically, when I move my mouse side to side in game it tracks fairly smoothly. However, as soon as I use the keyboard to enter another input (eg. WASD movement, tab to view scores, space for jump etc.) the camera begins to move extremely erratically as though the mouse is experiencing some sort of severe input lag. It drags and then suddenly jumps to where it should be looking. The delay isn't constant.
The problem started this evening. Tested it with a few different mice and the touchpad. As far as I can tell (just ran a couple of simple tests in paint to check for skipping, jitter etc.) I don't seem to have this problem outside of the game. I tested it in 3 servers (Martial Arena, United MA, and Pulse) and it happened in all of them. It starts as soon as I enter the game, including in the unit selection screen, but not in previous menus.
Any help troubleshooting would be appreciated.