The more I read about this, the more I'm thinking that Linkster could be on the right track.
That this is not a traditional penalty like a pure dupe penalty, that this might be the work of the new meta refresh trick.
The leading clue is the change in PR. The new meta refresh trick does, apparently, kill the original pages pr, in the same way that a refresh traditionally does, but backwards, if you follow my meaning.
I guess the way to tell is to pick a unique string of text on your index page, and search for it with quotes. If you find it on a page that isn't yours in the google serps, chances are you are the victim of the meta refresh trick.
Apparently it allows you to truly steal pagerank.
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