Strange

This is probably down to the area rotation Xaser did (although no promises that this is the cause, as I've not seen the extent of the movement)

That and the misalignment on the teleporter are both caused by the rotation, yes.

The conveyor belt show here scrolls the marines from right to left of the screen but the floor texture scrolls front to back.

http://i45.tinypic.com/2mcsynd.png

Already posted here:
viewtopic.php?f=43&t=2633

Merged, it's less cumbersome than having duplicates. Also of interest is this, since it might be a ZDoom bug.

In either case, a quick fix can be made by creating a rotated texture in TEXTURES, but then you have to animate it as well in ANIMDEFS.

Please use a revision of ZDoom that is at least r3669 and it's fixed.