I was thinking we could use the python api to do before and after comparison and get some insight at a vertex level but my version of poser decided to phone home last night so no way to take that further at the moment. What would be useful is to understand when a subdiv occurs. I understand Nerds comment about repeatability being a problem, assume this becomes important at higher divs otherwise HD morphs would be unreliable. I always thought the sudiv only occurred when the preview slider was changed or when rendering, if that's the case the subdiv mesh would not be changed by by a Goz - that doesn't seem to be the case reading above. One additional thought how does poser handle vertex welds? If its by proximity or some other on the fly method could this getting broken - just trying to think why an extra vertex would appear.