Been playing on my Dad's computer a lot recently. Not sure what on earth causes this, but it seems to be an issue with the sync to the display clock, if I had to guess. Only happens when I'm in full screen. Attached is the pic to show you what I mean- had to keep it full res to make my point. http://filesmelt.com/dl/gfxtrouble1.png Any ideas? EDIT: Forgot my hardware model. It's either a Radeon 6770 or 6790.