I have been stumped on this issue for some time now. I have a helicopter type ship, and after a certain amount of time the 2nd gun position gets off center from the cross-hair. Thus, you have no idea where you are firing but to look at the tracers and bullet impact sites. Everything starts off fine, but when you start firing and the pilot is flying around, it starts to slip from the crosshair. This can be corrected by dragging your crosshair target as far to the bottom left of the screen as you can, after that it will re-align... temporarily.
Any ideas?