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Well, no one forced him to use attributes for the material zone names, did they? It looks like it was just one of those ad hoc design decisions that proved unwise in hindsight. Anyway, he must have fixed it by now, because V4 has been around for some time.

this is fixed with a little procedure who redefine the material to an acceptable variable for python :

material -> variable

1_HeadSkin -> HeadSkin
Skin-Body -> SkinBody

since bagginsbill replaced  the AMUCSS with the VSS who work on almost any figure i think this is not a problem anymore, and if people want to use the old AMUCSS they have the V4 version to see how to handle this

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Incidentally, does anyone know how Poser orders the material zones in its dropdown menues? From what I'm seeing, it's not the order they appear in the .obj file. It would be nice to be able to put things into some logical order.

AFAIK this is the material order in the cr2 who is taken in the menu, with maybe the Preview always moved to the last position, you may try to edit some cr2 to confirm this