I see there's a thread on mouse accel, but I don't think it's the same thing I'm getting. When I'm standing in the spawn, my mouse sensitivity is pretty low. I can flip my mouse back and forth along the length of my mousepad and my character will maybe do 90 degree turns, but if I step right outside I'm doing more than 180. It's difficult to test if it keeps changing as I play with all the dudes shooting at me and stuff, but it definitely feels off at times. Especially with "tracking" type weapons like the jet engine and assault rifles, I find myself suddenly overshooting by about 90 degrees. I didn't have this issue in other recent FPSes I've played. I've turned off mouse smoothing but it didn't seem to have any effect on this particular issue. Any other settings I could play with? E: I seem to have fixed it by adding "bViewAccelEnabled=False" into my C:\Users\***\Documents\My Games\UnrealEngine3\HostileGame\Config\HostileInput.ini Will leave it a bit and see how it goes.