I upgraded to Vue 5 a few months ago, and I have NEVER successfully imported a poser 6 pz3 file without it crashing. I have all the updates also. I never had a problem with Vue 4.  I won't be getting Vue I or any other version any time soon.

MS Windows 7 Home Premium 64-bit SP1
Intel Core i7-2600 CPU @ 3.40GHz, 12.0GB RAM, AMD Radeon HD 7770

PoserPro 2012 (SR1) - Units: Metres , Corel PSP X4 and PSE 9