Spoiler: Pic of stacktraceSomewhere, somehow, someway, Winter's Fury has become broken. A while ago, this wasn't a problem -- I'm assuming this might be something to deal with tags as it appears to be infinitely looping, and this was working a while ago by itself..
Simply launch the game and sit there through the intro in the titlemap with the debugger attached. It'll get to a scene where a giant door is closing as the camera's pulling back, and it'll angle down after a short moment, and boom. Crash.
I'm using code from the currently latest git for GZDoom.
Also this is a GZDoom mod which is why I'm reporting it here than on ZDoom, unless you wish me to post it over there otherwise, Graf.