I have had the same thing happen with V3 and M3 in the same scene. Sometimes I loose morph control with V3 and then it can be m3. The temporary 'fix' is to simply restart Poser again and reload the morphs, when I'm using the body morphs. Perhaps its a memory problem or cross talk problem I dont know but I do know that P7 sr1 crashes a lot more these days than I ever had with P5 or P6. Sorry I can't be anymore help.