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* 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 or something else.
*soon only to be available in two flavours -  DAZ and Renderosity