Several users on our network get a blue window on booting up. It appears to be a blue screen of death, but it is in fact a large window with a standard gray frame. It has no close/restore/minimize buttons, resize handles, or other features.
By increasing the screen resolution, users can reveal the edges. They can then grab the top edge and drag it down behind the menu bar out of the way. Days or weeks later, it appears again full size. It doesn't seem to interfere with ongoing operations. Virus scans are negative.
Does anyone have any experience with this, or any clue as to what causes it?