Yes.  And as you noticed not all the body morphs reset.  I am only imagining that the facial features are custom and not connected in any way with dial spun morphs.  Having a second unmorphed M4 just resets the everything back to base when saved perhaps because of some crosstalking between the figures.  By memorizing the morph before saving, I embedded the changes into the figure so it correctly loads back with the scene is reimported into Poser. 

I would look into it further, but decided to render the couple.