Quote - Now what is it that causes morphs to revert to zero?

If the 'Morph Channels' option was selected when saving the pose, and if the morphs were at zero when the pose was saved, then that would be the explanation. The pose is just restoring the morphs to the (zero) values saved in the pose. If 'Morph Channels' wasn't selected when the pose was saved, then I don't know the answer, and I would probably need to see the figure cr2 and/or the pz2 to work out what was happening.