I finally got it to work. The OBJ from Zygote had several polygons with more than 4 edges. Poser had no problem importing this OBJ as a prop, but was complaining of geometry errors when I attempted to import the hierarchy. After converting the OBJ to use only 4 sided polygons or less, Poser was able to import the hierarchy without problems. I used the depent utility recently posted to the FreeStuff section by Anthony Appleyard. I was able to run it using VirtualPC on my Macintosh; I hope a similar Mac utility will be developed.