I failed to mention in this thread the site I discovered this on is bliley.com. (I recently edited original post)

I can understand PR vanishing from a whole site, for whatever reasons, but what seems unexplainable is part of a site's PR disappearing, which is detrimental when the pages contain all the important information of a site. In this case, all but the homepage. Why not the homepage, and why every other page.

Interesting to learn this phenomenon has occured elsewhere too. I'm baffled.