A majority of the time, when Slicer3 is exited, either from the File menu or with the Windows close box, it generates a window full of error messages. This window appears and disappears too fast to be able to read the messages (isn't this a bug in itself?), and Windows catches the bad exit status and produces the usual 'report error?' dialog box. This problem is not 100% reproducible but appears to happen about 80% of the time. It does not seem to matter what you do between program start and exit: the problem happens even when you exit immediately after starting up.