I have been trying out the old demo wads which shipped with older versions of Edge:
demo-Fanatic.wad
demo-Multi.wad
demo-Slopes.wad
etc.
They are riddled with bugs in every EDGE after test2, with miscolored sectors and wierd graphic artifacts.
The slopes demo(demo-Slopes.wad) also has some wierd physics issues when going up and down the stairs (sort of an odd, random, slowdown of player speed)
The demo-Rot16.wad displays the sprite with a solid black box around it.
The demo-Mirrors.wad exhibits graphical anomalies when looking at certain angles, like seeing through the map geometry or just getting wierd black textures.
The flat alignment/scaling demo is also broken.