This is how my desktop looks like after moving Firefox window arround:
The background just doesn't redraw, there is no wallpaper. It is like that since update to 12.04 - it was the same in 11.10 but I had special intel drivers then that fixed this problem. Doesn't seem to be fixed in 12.04 even with the ppa I was using then. What can I do? I couldn't find anything about it on Google because results were unrelated. :( I have Samsung RF-511 notebook with Nvidia card turned off - so it's using only Intel from i7.