I've been there. I'm guessing you haven't installed the Poser patch which solves a lot of these problems. Get the patch from either the metacreations website or from ghosteffects. If that doesn't work, Get the UV mapper from the Free Stuff (even if the patch works, get it anyway - It's an amazing tool) - and open up the object file with it. Remap it (there are instructions) and save it. I'm no expert on this by a long shot, but I hope this helps.