This problem happens every now and again, and I cannot identify the source. When I move the mouse, it sometimes tweaks a little bit. In other words, it is not as accurate as it is at other times. When I move the pointer around in a circle, the pointer-circle will sometimes shift positions on the screen, and I'm wondering if this has anything to do with my GPU settings. I have an X1600pro and my res is at 1280x1024. I fooled with the settings a bit, but the problem is still persisting (I also tried unplugging and plugging back in the mouse). I sthere anything else I can do to fix this little annoyance? Thanks for any ideas.