Loibisch posted that he was having a skip pixel problem with this new mouse.... I think this mouse rocks but I am having a problem somewhat along the same lines. Try this with your mouse right now....move it to the far right/middle of your screen... now at a fast pace scroll to the left....does it move in a left,down, then left motion when you go fast? try it the opposite way and it moves right, up, right....for me anyways does it do it for you guys too??? sometimes when i move my mouse really fast it goes majorly berzerko! running USB win98 2nd edition. newest 3.0 drivers too.