This is a weird one.  I ran right-to-left arm symmetry on the figure shown in the attached image.  The left collar went kablooey.  The mess persists through joint transfers from other figures.  It's still there after editing out all the collar and shoulder joints from the cr2.  It remains after pasting in good joints from a version saved before the problem.  The figure itself seems to have become corrupted, as far as Poser is concerned.  I can't find a toggle for this in the cr2, but it only affects the figure on which the symmetry function was performed, and it persists after Poser has been closed and re-opened.  This is not a Poser memory error, at least beyond whatever happened with the symmetry function to cause the issue.  It must be stored in the cr2 somewhere, but I can't find it.  Pretty weird stuff.  :scared:

Has anyone seen this before?  Do we have a workaround or fix for this issue?  If this is a known bug, has it been reported to the Poser Team? 

The problem here affects only the shoulder bend, with the distortion present on the collar.

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.