Like I said, it's an odd one. The **mats = act.Materials()** line definitely sets mats to None, exactly as we'd expect (the if mats is None: / poser.DialogSimple.MessageBox("mats is None") proves that), but somehow also flags an error that isn't caught by using a try: / except: ...

Anyway, just uploaded the script to the Renderosity Freestuff - should be appearing there soon. Here's the first of two images to help people who want to try it out.

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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).