http://bugs.winehq.org/show_bug.cgi?id=31550
--- Comment #6 from j.wielicki@sotecware.net 2012-08-26 08:30:03 CDT --- No, the attached patch does not fix the error (backtrace looks the same).
I found the reason for the duplicate keys, the opengl one has a typo in its name ;). So gdi is effective and also the trigger for this bug. Removing the gdi key makes the error go away.
_But_ I am using gdi to work around a problem in another application (Neverwinter Nights). Not sure whether this bug still applies then, as I probably just could setup the renderer for Neverwinter Nights and leave the default for Patrizier 2.
I think though that it should work with both ;).