I used to use RDS and had the same problem alot. RDS is probly looseing a Vertice information on import of obj file. I would normally import the obj to RDS then save a scene file. Export as an obj and test the exported obj as a morph in poser. If you have no error and when you slide the dial and nothing happening. You now know you have a good file to work with in RDS with out wasting time on one that will never work. Hope this helps and makes sence.