I am having the same problems in importing Poser 6 figures/Pz3s.  One day it worked fine and then next day  it would tell me  it was unable to load any Pz3s.  No changes to anything.  Vue 4 still works fine even without the latest mods.  Vue5 (not 5infinite) tells me that I'm out of memory and I'm running 2 Gigs of Ram on a new Dell.  I have managed some work arounds  such as grouping figures as single meshs.   The converter program for files older than Vue4 worked once and then told me I had no more disk space (100 Gigs left on that disk).  It then quit alltogther telling me I had no more disk space left.  Oh yeah.. I don't have a Vue older than 4 that I used for any of these files.    But.......my main question is;  did anybody do  BETA testing of Vue 5 with all these bugs?   These forums are a GOD SEND.   I don't do animation and V5 and when it works does excellent but  as a cash paying  (OK credit cards also) purchaser you shouldn't have to "work around the problem". 

It's kind of like the Maytag refridgerator I bought that came to my door with a long list of "upgrades"  that needed to be done after I got it.  The fridge went back to the business that day. 

 E-on needed to prepare a little more me thinks!