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In other words, Google's backlink report is incomplete. The reason is to presumably thwart seo activity. That is why the PR checker no longer updates once a month.
End of story.
I'm putting this post into the Library so that next time somone asks this question (like next week, hehe), we can give them a link to this thread.
Additionally, this question belongs in Google News. The Link Development forum is about discussing ways for developing links. ;)