Thanks so much for reading through all that and trying to help me understand, but I'm afraid I've still got some work to do. Is this stuff documented anywhere? Are the contents of these .pz2 files determined by DAZ, Poser or both?

I suspect some of the anomalies that I've pointed out are simply oversights or mistakes by the vendor. I'm surprised that Jessie works at all. She reminds me of some women I've known in real life - gorgeous on the outside, but on the inside she's just a mess.

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OS: Windows 10 64-bit, Poser: 10