I'm not sure what is happening in the demo version of C5. I'm using C5Pro with the latest update 5.0.2 and I have been loading Pz3s, CR2s from both Poser 6 and Poser 5 with out the problems that you mention. using the Native poser import the Pz3 bring in the animation data if you animate the figure in Poser 6. You can continue to add Poses, use morph targets, load clothing, Hair, to your character within Carrara 5. Now if you are using Dynamic hair than that will not load via Native poser import. For that you need Transposer 2. Transposer 2 is only included with C5Pro. If you only want C5 than you can also purchase Transposer 2 as a plugin for it. May I ask what Poser figure are you trying to load into Carrara 5?