whenever I drag on my desktop the dragged square turns black, it turns back too normal after 5-10 minutes, I have no idea as too what is causing this... here is a picture of what i'm experiencing..
(if image doesn't work http://tinypic.com/r/20rjq4i/7)
(if image doesn't work http://tinypic.com/r/20rjq4i/7)