http://bugs.winehq.org/show_bug.cgi?id=10142
--- Comment #46 from Alex Balut alexandru.balut@gmail.com 2010-05-06 03:22:05 --- (In reply to comment #45)
Happens too in shredder classic, the contents of the window (not the window itself) disappears when you switch between desktops.
This looks like a different bug.