...Look at the Orientation values in the Joint Editor Window. Perharps, it is your problem, Check in the Joint Editor if the prop "In Hand" has some values in the Orientation cases. Do the same for the prop "In Sheath"...

You were spot-on with that ! So thanks very much again. Setting the orientation to zero in PoserPython is easy with actor.SetOrientation(0.0,0.0,0.0), but the DAZ Script function to set orientation requires a quaternion.

So I've posted over in the DAZ script forum about what value I should set that quaternion to - I realized that my initial idea of (0,0,0,0) couldn't be right, and it looks like (0,0,0,1) is the correct one...

---

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.