After a few minutes of play the mouse tracker icon freezes but the mouse is still working, you just can't see it.  If you move across an activation panel it will prompt it and you can activate it you just can't see where it is.  I can tab back to my windows screen and it readjusts, but that makes for a troublesome game to say the least.  I'm using a logitech trackball and have tried adjusting the configuration while in play but can not find the problem.  Any suggestions would be appreciated.