I very rarely use the ground plane for anything, because it keeps disappearing on me. I finally had to resort to post-production editing of the shadows. I have been having this (offset) problem with the shadows pretty consistently, but I have been working around it using different camera angles. I hope it is a bug. Can you render from behind one of the one-sided squares, 'Rat? Or does it still get in the way, and need to be hidden? I'll try that. Thanks alle, and Alle.

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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.