This definitely had something to do with the mp3art.dll. I have had the plugin initialized in my Menu.skin since the dll was released. It just started disappearing as it does now since the 12/06 release from what I can tell. When I run the 12/06 version Guino JUST re-released, my album art also disappears. Going back to the 11/04 version, the album art works as it should.
In the mean time, using a text editor, remove the
line from the menu.skin and save it. That should fix it for now.