: I've wandered around the earlier parts and haven't seen anything yet, besides
: a lot of empty textures. I'm assuming those are meant to be there, though.
Oh, you must not be using the Eternal textures. I just presumed that people knew where to get them from and/or already had Eternal...
Download this:
http://eternal.psyjnir.net/files/Shapes/Textures/TexturesV4/shuttles/Set2Shuttle.sit
which will at least put SOMETHING in those empty textures, although it's not the pretty hires MML-replaced textures that are actually used in game.
How much of the "earlier parts" have you wandered? Have you walked past the pillar with four terminals in the center of the map? That's one of the places it crashes for me. The other place is attempting to enter the room behind the platforms-door in the area beyond the transporter to your right, as you enter the map. (The correct sequence for those switches is, left to right: on-on-off-off-on-off-off-off. That will open a .5WU-wide passage through the platforms that you should be able to walk through, except that it crashes there). I suspect that it would crash in the other two similar platform-doors, but I can't get to those areas as they are beyond the four-terminals.