Spoke too soon.  The above only helps with the currently open file.  Once Poser loads that file back and saves it again, it drops the ERC.

But it's strange.  I have five figures in the scene, one of them completely hidden, on a per-actor level.  Antonia's head and neck are visible.  But the fully-hidden figure retains ERC and Antonia loses hers.  So the problem is seemingly inconsistent.  And it looks like something that will definitely spell trouble, down the road, once more people start saving Antonia in .pz3 form, with clothing and hidden bits.

Poser has the gremilins.  :cursing:

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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.