so... I installed fs2_open on one of the school PCs a while back with some old mediavps (can't remember if they were 3.6.7 or 3.6.6 or what), and a few days ago I upgraded the mediavps to 3.6.8.
I opened up fs2_open, and went to the techroom to see the shiny new models, and what did i actually see? Nothing! I could see the colored glow lights all right, but no actual models showed except for the Hercules and HMII. The odd thing is that the game functioned perfectly with the old mediavps.
The PC is a P4 1.8 GHz with 512 MB ram and a 32 MB nVidia Riva TNT2 graphics card. Older but still performs better than my laptop

The options I've enabled are specular, envmaps, glow, jpgtga. I've fiddled around with all of them and nothing seems to work. The VP files are intact though and all the models are there, just not showing in either the lab, techroom, or ingame.