Right... the .rsr that sits with the cr2 is the thumbnail. Don't delete that one. Look in your RuntimeGeometries... folders and find the objects that Poser refereces for it's stock characters. Those will have .rsr files associated with them. Those are the .rsr's you need to delete if you make a change to the associated .obj. You're custom .obj's won't have .rsr's to delete yet becuase they are embedded into the cr2 rather than referenced outside it.