@lesbentley:

Try rotating the plane on any axis, to see if that changes anything.  Possibly this is a flaw in the vertex-selection process I'm using.  I'd expect that case to generate a console message, but it's probably something that should be tried, at least....

I'll set up the special-edit version for you.

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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.