How bizarre !?!?!

After I'd saved the scene as Untitled.pz3 the simulation started playing correctly.

But after restarting Poser by opening Untitled.pz3 it wouldn't play the simulation.

However, after I recalculated the simulation it started working okay.

It appears that the 'logic' of the Renderosity forum software has infected Poser... ;o)

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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.