I haven't seen this problem when I work with Genesis but I haven't used any of the creature morphs on a regular basis.  Are the poses designed for Genesis or are they universally applied from another model?  It almost sounds like a cross-talk problem if another figure is present in the scene.  You could pose Genesis in a separate scene and delete all background props and lighting after posing.  Save the scene.  Go back to the original scene you're developing and import Genesis from the saved scene.  This might work.  Now I haven't tried saving scenes within Poser and adding them to existing sets from the Library.  I think this might work also.