Thanks for the input, guys!  Y-Phil, forcing Poser to show backfacing polygons didn't change anything.  Evergas, if I switch to wireframe view in Studio, the hair appears in mesh form as expected.  It seems to be a very fine mesh, so I have to zoom in quite a bit to differentiate the polygons, but it appears to be mesh-based nonetheless.  Hborre, I just bought Ashendun, a G9 hair item by the same vendor as Voss.  When I try to bring that into Poser, I get a skull cap but nothing else.   Checking for a wireframe on it appears to show a very fine mesh, just like Elene.