ZDoom

fixed.

The hard crash was indeed UDMF only and my last commit already fixed it.
The heap corruption, though, had nothing to do with 3D floors, it was just random chance that you discovered it only in these maps.

Is it because of the map format? UDMF vs. Hexen format for example?
[url=http://i.imgur.com/UWazR1b.png][img]http://i.imgur.com/UWazR1bl.png[/img][/url]

[quote="everamzah"]I couldn't find Enjay's Burghead mod.[/quote]
http://www.doomworld.com/idgames/index.php?file=levels/doom2/Ports/m-o/njbgpabh.zip

I couldn't find Enjay's Burghead mod. I made a simple test map and it crashes here. https://www.dropbox.com/s/a6o9m8cxllpk39l/160test.wad

Yes, I used Enjay's Burghead mod.

Did the map you tried testing with have 3D floors? Specifically Sector_Set3dFloor?

I wasn't able to reproduce this with any map I tested, but there was definitely something wrong here. The dirty setting was called in some places where it shouldn't, in particular from the map init code where not everything was properly set up yet.

Can also confirm this.

Same here.

For whatever reason, this recent commit [url]https://github.com/coelckers/gzdoom/commit/925305aa051157709ae6a98f21c6d2497ec4b9f9[/url] for updating the vertex dirty states ends up crashing GZDoom hard whenever it encounters a map with 3D floors, such as DoomRPGs Outpost (a more innocent crash) or, even worse, Stronghold (a heap error!). Tested on a clean build, both me and Edward850 can confirm it's happened to both of us.