Comment 2 for bug 773533

I have had this problem as well, but am not able to reproduce. I've attached a screenshot showing the precise area that caused problems for me on this occasion by using GIMP to draw dots where I could around it. In this case (and for a 1920x1080 screen) it was the area within (420,434)-(1513,699) but outside of (428,441)-(1506,652) (specificied by the pixels immediately outside of each bounding box).