Ray fixed the problem. To quote…
"This was an issue with the galleries/gallery.php file being incompatible with the powerstore details page. I fixed the problem and it appears to be working now."
And…
"The problem was how the gallery code was determining the path to the images. Powerstore uses Framework Builder technology that adjusts the working folder and threw off the gallery's ability to determine the correct folder."
Apparently this is not a problem with more current versions.
Mick