i have been ignoring this issue on my 1st generation mac pro running lion.
sometimes the computer goes to a blank (my desktop color) screen with just the pulldown menu item area at the top and the dock at the bottom.
desktop icons just totally disappear.
i'd post an image of this after a restart but it - ooog - i just clicked on finder in the dock and everything is back. any ideas on what is up with this? i sometimes also see a LAG in the changing of a desktop icons name so that the old name sort of hangs there for awhile (2 or 3 seconds) until it eventually changes...
Mac Pro, Mac OS X (10.7.4), 64 bit Win7 in Parallels | iCloud