Well, just wanted to say thanks to everyone again and to report that I have things working. Did a simple model, saved it and tried to import to Poser with the same "invisible model" results I had been getting, then having confirmed that the model was having the problem, I loaded the mesh into UVMapper and checked the groups - Wings had saved groups as head_skin, head_teeth, head_innermouth, etc - so I loaded it into Wordpad and did a search and replace to get rid of _skin, _teeth, etc and saved it back again, got rid of the rsr file for the model and imported it to Poser again and lo! I had a model which was no longer invisible! Problem solved. Many thanks.