C5 Pro opens both Poser native (opens Poser files with no Poser application on you system) as well as using Transposer (which needs a copy of Poser on your system). Make sure you are selecting the option that will work. C5Pro works with both Poser 5 & 6.

The native import will not bring in dynamics, etc., but the native Poser files allows for detailed manipulation of a Poser model within Carrara.