I've recently had a strange problem. Occasionally, my desktop icons all disappear (everything except for the Macintosh HD). I can still access the files by opening the HD then navigating to users/user name/desktop but the files on the desktop are gone. When I try selecting the desktop, only ghosts of the folders appear (no ghost files). Any idea what could be causing this? A finder reboots seems to cure the problem. (See below for a picture). I have 10.4.8 on a G5 with all the updates.