I have something of the same problem but only with the Victoria 4.1 Creature Creator Morphs. I can inject other morphs for V4, remove them and load my self made obj morphs.
I inject the morphs, poser 7 wait some time and no morphs are added.

Then I installed the creature creator morphs it tried to run a bat file in the H:Poser 7RuntimeLibraries!DAZDzcreatePFiles-V4.bat
All the files in the product list file are present, except the bat file.

It look strange to me that I cant only add the files I want, I seldom want to use more than a few morphs on a figure.

I use poser 7.0 on win xp sp2 and Victoria 4.1

Magne