Could it be then that Vue is looking to the wrong Poser installation? That you had Poser 5 installed, connected Vue to that and have not changed that to Poser 6? Effects as you described them can happen then. For example when you import something from Poser 6 that was installed in Poser 5 as well - then of course Vue will find all sources. But things that are ONLY installed in Poser 6 will not work then. Maybe you check that in the Vue preferences.

One day your ship comes in - but you're at the airport.