Okay, so I got the version from the sig, and I did a quick test with the Medusa. No crashes anymore, but when I import through "open", then "import geometry", PCS2 shows no main mesh, and the tree on the right displays "detail0 (0)" under subobjects, which I assume means no main mesh was imported. The 3d view screen also shows up as completely blank.
I use a Radeon HD 3600 series card, though not sure of its exact model. Since I'm currently just trying to import stock fs2 ships, I don't think there's any bad geometry.
EDIT: Hmm, it seems to be working now. Now to puzzle out PCS2...