Comment 21 for bug 687567

I don't think the flashing is due to the fade animation at all. With no fade effect it is still possible to see the white flashes. For some reason, a blank surface is being created on opening a menu, only to be destroyed and replaced with the actual menu - the fade effect only makes it more obvious because it takes 50ms to complete, and disabling it improves the appearance of the desktop, but this is just a workaround, not the cause of the problem.