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Well, there have been some changes again. Not as many as in the June 24th update, but I have seen changes on a few sites I am watching.
The interesting thing is that this time all PR changes I am seeing are for a page jumping from a gray bar --> some PR or from some PR --> gray bar, whereas in June there were also changes where a page would go from some PR to a different PR.
So, according to the data I have, there have been at least 5 PR changes since beginning of May, and the dates I have are:
8th May, 19th May, 28th May, 24th June, 2nd July
There could have been other changes in PR in between that I have not spotted.
[edited by: tedster at 9:33 pm (utc) on July 2, 2009]
As far as I can tell, it looks like the change in Toolbar PageRank for your site is only due to some technical quirk and not something that you need to worry about.
Thanks to SERoundtable [seroundtable.com] for spotting it!
I was about to comment earlier on some thread here regarding the gray-barred disease when you mentioned that Google seems to have some "mysterious formula". To me, it looks like PR/TB is too buggy to be released for public. No conspiracy theories, no vague theories, no mysterious formula, nothing but a buggy behavior.
Since when they do export PR data to TB three times in one month (according to the OP, five times!) when in the old days it used to be typically every three months and then recently every three months followed by another "fix" update. It's getting from worse to worst.
It looks like after PR being replaced by site trust or domain authority, a lot of TB bugs, the recent "michael jackson" search issue, WMT weird data and many other issues, they are begging for Bing to take the lead of the market share in 2010.