Okay, I've found the problem.  It isn't the joints, it's the joint magnet which is built into Antonia-WM to pull the pectoral down.  Somehow the joint symmetry function made the magnet settings go kaflooey.  Huh.  Clearly magnets have no place in a joint setup.  It's a pity we don't have a bulge map equivalent which moves along an axis.  :unsure:

I suppose this still exposes a bug with the joint symmetry feature.  It shouldn't be affecting magnets.  Weird stuff, still. 

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.