hallo Gwyn,
I've already lodged a ticket, but as yet no answer. However I've been spending the day trying to isolate the problem, and can confirm what John Canver is saying (pity, I could have saved myself a few hours work by waiting!) lol 
If you change the Ambient Colour in Poser for all materials to white, it renders reasonably in Vue.  It takes a couple of minutes in Poser, but changes something that is totally unusable into something usable. Ok, where a light blue Diffuse is originally used, the skin will be somewhat redder in effect, but at first glance looks ok - I'm waiting for a render with better quality, will post it when it's finished.
However the SDK should be fixed!!!

Rob