Victoria 4.1 has to be installed into the Poser Runtime rather than an external Runtime and there could be something you missed along the way.

There is a full FAQ with lots of information about the newest V4 version at:
http://forum.daz3d.com/viewtopic.php?t=57553&highlight=victoria+++installation

I daresay the answer to your problem lies in there somewhere.

I know when I installed the Creature Morphs and the Muscle Morphs I simply ran the desktop updater which was installed with V4 and I haven't had any problems using the morphs when I've injected them.