Terrible Mouse Lag on Menus

Anytime I open up a menu, my mouse lags very badly. I have a dual 7900GTX SLI graphics setup, and an AMD X2 4800 chip and 2 gigs of memory, so it is not my setup. I've tried different graphics settings, including setting it to minimum, and it still lags just as bad. I've no problems with any other gamees, so it is definitely a SE 5 problem; I loved and modded the heck out of SE 4, I just hope Aaron gets around to fixing this right. I know he will patch it through eternity, but it's hell for it to be released with the number of problems it has had.

Oh well.

Dave, aka creator of Derek'sMod from back in the days