So, lately I've been wanting to get back into making WADs, but I haven't updated GZDoom in ages. So when someone with the latest version tried to run it, the map was completely broken. I tried for myself and sure enough, got the same problem. (Luckily I made a small test map just to house NPC's, items, and concepts I plan to edit, so i didn't lose too much work if it's SOL) Not only does my 3d floor seem to act like some impenetrable fortress throughout most of the map (in the main hallway)