http://bugs.winehq.org/show_bug.cgi?id=34166
--- Comment #12 from WineBuG winebugs140@gmail.com 2013-10-29 09:09:01 CDT --- This is the answer I've got from Apple regarding this bug: "Engineering has determined that this is an issue for you to resolve. One must render to the back buffer as rendering to the front buffer results in undefined swapping behavior."