Are you sure you have the transparency set to 100%? Alot of Poser things don't need 100% transparency, and it's not uncommon to find a Poser trans texture that has a maximum trans of 100% and a minimum of 50%. It works fine in Poser, but if you import it as a PZ3 into Vue, Vue will only assign a 50% transparency to it. That's probably your problem, and if it's not, remember that in Vue, for a trans to work perfectly, the blacks have to be pure black (RGB 0,0,0) and the whites have to be pure white (RGB 255,255,255).