I have attached a picture of what has been happening to my computer every now and then for the past month. I see no pattern as to anything I am doing when it happens, my screen just becomes erratic and when I move the mouse around all the imaging starts changing. I read some of the early 10.6 versions had some graphics issues put none that I read past the 10.6.6 version. Anyone have any idea what may be happening here? Thanks!