Hello,
I've just found out (spending an afternoon) that if have a series of different runtimes named:
!Victoria4.0
!Victoria4.1
!Victoria4.2

it could happen that Poser (in my case both P7 and PPro)
is not able to get the correct reference to the textures located in some of those folders:
the first in the alphabetical list works fine (!Victoria4.0 in my example) all the others similarly named do not.
In which sense do not?
In the sense that Poser (randomly) will not load textures from !Victoria4.1 and !Victoria4.2, even if all references are correct.

I have renamed the folders to
!Victoria4.0
Old4.1
New4.2
and then all textures loaded nice without any problems

Have You experienced the same?
If my explenationwas too poor, just drop me a line and I'll try to improve it (i do not speak english as my native language)

Cheers
Mario