I have experienced the same problem with a couple of items from a Poser 5 scene I built and then imported into Carrara 3.0.4 (Mac). The scene in question has about 20 or so items in it, most of which import fine. Haven't experiemented too much yet with possible alternatives other than separate OBJ imports, which work well although they're tedious. I'm considering breaking the scene into two or three Poser files containing fewer items and seeing if that makes a difference.