When It happens again I'll post back here. I'll try to be more specific about what I was doing but, as you'll appreciate, when I'm updating a gallery item recording what I do step by step for possible bug-reporting isn't at the front of my mind.

Possibly related. A couple of days ago I was editing a gallery item. I removed one image, added a few new ones, and then saved. I got a red error message - I can't remember what it said, but remember thinking that it obviouslt doesn't like you removing an image and adding images at the same time.

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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).