It is a scaling issure. One way to get it to work is to import your object in Poser, scale and position it and then export it out of Poser. Make your morphs from this exported version (using the objto3dm utility). This exported obj will be very small in Rhino, you can 3D scale with a factor of 100 to make the morphs. Later 3D scale it with 0.01 and export it. This works for me everytime.