Follow-up to my post above...

When I purchase a new product, I install it into a temporary directory to check it out using P3DO Explorer and P3DO showed what I described above.

This profuct does not have .png files. When I loaded it into Poser 6, the .png files are constructed by Poser 6 (and Poser 5?) and they appear to be correct, so this issue has become a non-issue for me.

It still may be an issue for Poser 4 and Poser Artist users though...