Example pictures:
How it should look (Gzdoom):
Spoiler:How it looks like in zdoom:
Spoiler:Also, if you look around, the game will crash, with bigger textures the game will just work fine.
Test wads:
Broken wad (1x1 texture): http://www.mediafire.com/download/o4k80 ... AND_v5.pk7
Working wad( > 1x1 texture): http://forum.drdteam.org/download/file.php?id=3137