My nagging thought was spot on - when I moved my scripts from the desktop runtime I had them in to (backslashes changed to forward slashes simply to post on this forum) C:/Program Files (x86)/e frontier/Poser 6\Runtime/Python/poserScripts/ it worked perfectly, Mac syntax and all.

This is something I clearly knew 12 years ago as it's in the readme of my first freebie with a PoserPython script* - "2 - Copy the contents of the 'Poser Default Runtime' folder from the downloaded zip file to your DEFAULT runtime (These are the PoserPython scripts, which are called from PZ2/PP2 files - if you have several runtimes, then in order for the calls to work it appears that the PoserPython scripts MUST be in the main runtime, i.e. under your Poser installation)."

*South East Asian Duel (Poses, Prop, Scripts) - still avaiable at ShareCG

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The 3Dcheapskate* occasionally posts sensible stuff. Usually by accident.
And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU.

*also available in ShareCG, DAZ, and HiveWire3D flavours (the DeviantArt and CGBytes flavour have been discontinued).