I ran several scenarios and I assessed that there is something incorrect in the prop coding.  When you load La Femme for the first time into Poser, the prop works.  If you load a second LF figure, the prop scripting fails.  Delete the figures and reinstall them, the prop still fails.  Reboot Poser and reload both the LF figure and the prop, everything works again.  I did have Poser crash every time I deleted LF from the scene.  Taking a closer look at the prop's script, I did see a script formatting issue which corrected the crashing.  Beyond that, I am at a loss as to why the prop stops working after the first install.  ATM, I recommend saving the figure either back into the Library or exporting LF out as a partial scene.  Importing the figure from a partial scene retains the functionality of the dials.