I confirm that this happened to me as well, at least twice. When it happens rebooting removes the problem. I don't have any clue about special reasons for this to happens, it looks totally random, and I don't use graphic screen savers, only lock screen. I'm running version 10.04.
I confirm that this happened to me as well, at least twice. When it happens rebooting removes the problem. I don't have any clue about special reasons for this to happens, it looks totally random, and I don't use graphic screen savers, only lock screen. I'm running version 10.04.