santapaws - 6:24 pm on Sep 30, 2008 (gmt 0)

Fact: The day TBPR shows an update the data used is 3 to 4 months old all ready. Fact: The TBPR shown is NOT necessarily the real PR of any page at any given time. Fact: Many graybar pages one quarter will show PR the next quarter with zero changes to the site or pages. Fact: Many pages that show a TBPR of 3 or 4 one quarter could be gray the next and bounce back to the original 3 or 4 PR the next quarter with no changes to the site structure or pages involved. Fact: TBPR is as broken as the back link operator Google feeds you when you check back links.

no way is the tbpr 4 months out of date, its weeks not months.
I wonder what you mean by real pr. Perhaps you mean pure raw page rank as it was in its very early days in which case i think you mean its not old the old formula for pr. Or maybe you mean its nothing to with the pr that is applied to your page for ranking purposes, well i would disagree, its just not the same figure for all pages because as was said, its indicative of other factors when it hits the toolbar.
Yes its goes grey and normal again because the signals they were reacting to have changed which might not even be onsite, or their own parameters have changed, or you was on a threshold that can easily shift either side at any one moment, and tbpr is a snapshot.
TBPR is not broken at all. The backlinks is not broken either, its been de seo-usefulised.
Thank you for your facts. :)