So my brother just got the newest white macbook and i was playing around with it, surfing the internet in safari, and then when i closed out of the window, there was this huge blank square. I think it's the same size of the safari window i had open, so maybe safari created it? I tried quitting everything, relaunching the finder, and changing the wallpaper with no luck, so i shut down and that worked. also, right before it shuts down when the icons disappear on your desktop, the white box went away too. anyway, has anyone else experienced this???