OK, I'm putting r193 online right now. It still seems to be behaving itself in both debug and release flavours. I think you have managed to nail this one.
Can you recheck this with the latest ZDoom. Randy made a some changes a few weeks back but these have not been tested yet. You can't check with GZDoom because I still have the workaround in place that prevents the crash at the expense of a major memory leak.