I thought of that myself, I cleaned my mousepad and my mouse sensor, nothing changed. Then proceeded to use a different mousepad with a different mouse, same thing! I've seen about 3 or 4 posts about this subject of people experiencing the same problem, but or A-it got no solution, or B-people would call the ones with the problem uninformed, delusional or liers. This *IS NOT* a placebo, I played osu for 40H in 4 days, never experienced this, and when i was switching songs BOOM it happened, I tried raw input, changing resolution... Nothing helped, everytime i start a slider, i can just draw a straight line, the cursor will follow, or try to follow as much as possible the slider.