I've noticed that the Poser 11 sample callback "randomHeadVerts.py" (under C:\Program Files\Poser Software\Poser 11\Runtime\Python\poserScripts\SampleCallbacks) creates its own list of 1000 random numbers first because it says random.random() seems slow, but that wouldn't have anything to do with the parser error I'm seeing, would it ?

I also noticed that I'm setting the callback on xTran and explicitly changing xTran in the callback before returning the original value of xTran, which doesn't make a lot of sense - but again, that wouldn't be causing the parser error problem I see.

I've tried setting the callback on a different parameter, and using an explicit floating point value instead of random(), but the problem's the same.

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The 3Dcheapskate (also available in DAZ and HiveWire3D flavours) 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.