I also tried not changing it at all, just importing it into Sculptris and immediately exporting it, to see what would happen, and it did the same thing when I loaded it into Poser. It doesn't complain about the vertices or anything, it just applies it in that strange way. I also tried running it through Blender and MT Mirror, before loading it back into Poser (just to try some random things), and that didn't fix it either.