It started in iTunes, suddenly for no apparent reason the scroll bar would go to the bottom of its movement all by itself. If I tried to move it, it immediately zoomed back to the bottom. Usually this would be accompanied by Firefox doing the same thing. It keeps happening every now and again and I try to see what could be causing it. I have begun to suspect that it might be my presonus soundcard that seems to be plugged in when this happens although I'm not 100% certain that it hasn't happend with out it being plugged in. Sometimes logging out and logging in makes everything go back to normal, sometimes it doesn't help and I need to restart. It just happened again and applied to all windows with a scroll bar. Has this happened to anyone else? It's driving me bonkers. I'm using a wacom tablet (with latest driver), in case this has any relevence.