Boy, Im late for this party! Ive had the same problem myself. In my case the problem was the files I created had some faces with normals looking in and some looking out. I solved it by saving as an OBJ and loading into Anim8or (a free program). Selecting the faces in this is the key as those that look one way are yellow and the opposite way are blue. It is then a matter of flipping the normals. (Hey, and you pal!) Even some pros get this wrong but luckily Poser is very easy to export from so I have solved most of them myself. May not help but I thought I`d mention it B)