Ibelieve the issue with OP is the same one I run into from time to time. (And this is not a Poser 8 issue, this has happened for years...at least ever since I started with Poser 6)

If I load a character via inj pose, then use the remove pose, install another character, use the remove on that one through several iterations eventually, the morphs stop working. It happens on all the Mil 3 figures as well as Mil 4. It also happens if you load multiple copies of the same fiure... morphs only work on the last one I load. It can manefest in either of two ways: 1. The dials completely disappear. 2. The dials remain but do nothing.

The only way I've found to fix this loss of morphing ability is to reload the morph injections into the figures. This restores everything to functionality.