OK, I'll experiment with these suggestions, though I can't say I'm convinced yet.

In my experience if Poser can't fing a geometry (obj) file it gives you an error message and asks where the file can be found.

The actual pz3 file that's causing the problem contains lines such as:

        figureResFile RuntimeGeometriesnewFemaleNudeHifemaleNudeHiP3.obj

This isn't an absolute reference but is relative from wherever Poser happens to be located. If it worked from Poser 6 it should also work in Poser 7 as long as the obj file is in the  RuntimeGeometriesnewFemaleNudeHi directory of Poser 7, which it is.

Libraries (which ar treated differently from geometries and textures), are a different matter and Tirjasdyn is probably right in that respect. Since I'm not trying to load the figure from a library that shouldn't cause a problem though.