http://bugs.winehq.org/show_bug.cgi?id=10841
--- Comment #27 from Dmitry Timoshkov dmitry@codeweavers.com 2008-05-25 22:25:35 --- (In reply to comment #26)
Also, when you exit a full screen app (not just switch from it to the desktop), the resolution still isn't changed back.
It would be helpful to at least name that app, Wine version tested, and whether a demo of it is available.