http://bugs.winehq.org/show_bug.cgi?id=34643
--- Comment #6 from Vincent Povirk madewokherd@gmail.com 2013-10-03 17:43:11 CDT --- This may be related to the Unreal engine. I saw a similar stack trace in Unmechanical.
I have reason to hope this will be improved by thiscall support in Mono.