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Just a thought... are you sure that was even a real PR4 and not an assumed PR value?
I would think.. and I am going off the cuff here... that unless the framed page was reachable by the SEs somewhere OUTSIDE the frame... then that page would remain basically invisible to the search engine and probably have no PR at all?
Assuming the site is a basic framed site... say a left 'parent' frame with logo and nav and all content in pages in the right 'child' frame... isn't the problem with framed sites and search engines largely that search engines can't get to that right frame content?
If there's an alternative navigation system, say a non-framed sitemap leading to the unframed child pages, then they should have some PR value, but otherwise?
<add> good grief... there goes a week's worth of question marks in one post </add>