odf, this image shows why I think the "private" joint centres don't move, or at least don't move correctly when the figure is scaled. The visual icons for the hand swing JP are obviously displaced relative to the hand after scaling, and the way the joint bends seems to confirm that the JP is acting from the location represented by the icon, though it's a bit hard to be certain when smoothScale and JCM are also influencing the joint. This is not something peculiar to Antonia, but seems to happen with any figure.

With my ERC scaling, I have only just gotten round to looking at the hands and fingers. Fortunately the fingers seem to be behaving reasonably well, but the same can't be said for the hand itself, which looks like it may be a problem.