http://bugs.winehq.org/show_bug.cgi?id=23841
--- Comment #3 from Javier Kohen jkohen@users.sourceforge.net 2010-08-24 13:34:25 --- (In reply to comment #2)
I can't reproduce this, but I have a theory. Does it still happen if you configure --without-xshape ?
Indeed this gets rid of the problem, though I get the WM's decoration around the window.