I now make a slight change to !CB-OK.PY by using a global variable (as per the randomHeadVerts.py sample script) as an incrementing callback counter to get this, which will increment the value of yRotate each time the callback is called:

And yes, modifying ANY parameter on the Body (or doing any of the other UI things*) causes yRotate to increase by 4, meaning that the callback IS called multiple times.

So I'm not going mad - at least no more than I already was.

So WHY does the SetUpdateCallback() cause this to happen ?

*Not true - selecting another body part and then reselecting Body appears to cause a single callback, and Edit > General Preferences > Cancel doesn't actually cause any callbacks, but going to the material room and back does cause four.

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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).