And confirmation that it's got nothing to do with compressed files. Even with the OBJs extracted from the OBZs the same problem occurs.

Curious thing though - why doesn't it ask me to locate spotLite.obj when I do 'Add a light' after 'Go back to Pose room ?

Also if, after doing 'Add a light' I change it to Infinite, Diffuse IBL, or Area Light it does that without any problem. It's specifically the Point Light that throws a wobbly. 

(No, the default scene only contains two types of lights - three Spots and one Area Light. So it's not that Poser had already loaded the othe light OBJs, at least not via the default scene)

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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).