I don't want to keep perseverating on this same issue, but I have a guess as to why I'm encountering it.  Poser figure actors can have three types of geometry.  Two might be called 'canonical', while the third is a Poser Techie hack.  The default figure actor (body part) geometry handling is geomHandlerGeom.  If you modify an actor with the Grouping Tool, that actor will acquire embedded geomCustom geometry if you save it in a pz3.  If you save a figure with geomCustom to the library, Poser spawns a new .obz file for the figure.  I hate having Poser mess with my obj base geometry listings and it doesn't seem to weld its obz exports, so I try to avoid geomCustom embedments in my figures. 

That's where the third geometry listing type comes in.  The objFileGeom listing allows an actor to have customized geometry, modified groups or materials, say, without using geomCustom.  It's a very useful option.  Unfortunately, objFileGeom listings in a figure look like they may be the cause of the bug I've been reporting.  The figures which are having the trouble use objFileGeom on the head and hip and on some actors I've added to the figure, mainly to introduce more screening groups for use with the Morph Brush and weight map tools.  Useful.  But, as far as I can tell, a figure with objFileGeom listings makes Poser go berserko when you use the new subdivision.  Or when you confuse the Cloth Room somehow.  The new skinning and subdivision tricks have made Poser intolerant of objFileGeom body parts, as far as I can tell.

Personally, I think that's unacceptable, but there's really no way to get that point across to the Poser Team.  Talking to Customer Support goes nowhere fast.  One is left to kvetch on various forums, hoping one of the Inside People will happen to notice what you're saying.  Poser's bug-reporting methodology is buggy and broken.  :unsure:

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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.