I'm thinking that these one-sided plane problems should continue on a new thread, so I'm just going to start a new thread (linking back to this one of course).

Here's the link - "One-sided face/mesh problems, tricks, workarounds, stumbling blocks, etc.."

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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.