http://bugs.winehq.org/show_bug.cgi?id=36837
--- Comment #4 from Erich Hoover erich.e.hoover@gmail.com --- (In reply to Kurt from comment #2)
... Avoiding this bug is quite difficult, since you never know where it bites. It is probably a new issue; sadly there aren't any backtraces for bug #30972 so there's no way to know for sure. ...
Have you tried disabling "gameoverlayrenderer" in winecfg? This DLL has been plaguing a lot of Steam games lately.