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About 3 or 4 weeks ago, I started to see it toggling back and forth from 5 to 6. I'm guessing that different datacenters have different info about my site. I've also noticed that the page's cache at one of the sites is from Dec 22, while from others it is up to date.
When I first saw the toggling, I was very happy to have re-attained PR6, and like other times, expected the change to roll out everywhere. But now it's around amonth, and I'm still seeing the same thing.
BTW, I have a subdomain that's toggling between 2 and 3 and another that's toggling between 3 and 4. It does appear that there's sort of a pattern.
When subdomain A is 2, subdomain B is 5 and main domain is 6.
When subdomain A is 3, subdomain B is 4 and main domain is 5.
Traffic (natural referrals from G and others) is as strong as ever. It's like the Google or my site is stuck in a timewarp, or in groundhog day. I feel like I just have to do one more thing correct, and I'll get my 6 back.
What does this have to do with AdSense? It does seem that my earnings were somewhat affected by my PR. When I went down from 6 to 5 my earnings went up a little, and when I was started to improve and toggle between 5 and 6 my earnings went down a little, in December.
But as for Toolbar PR, please search for older threads where it has been said by many members, including GoogleGuy, that there is Real PR calculated continuosly and Toolbar PR is exported from time to time.
Personally, I think it's often exported with a bit outdated data. So after Toolbar update, you see what PR your site HAD some time ago, now, a few months after tPR update, you see that your site had PR6 in the past, and when there's a flux to PR5, it indicates that half year ago your site had PR5. Now you could have PR7 as well and you wouldn't know it until next update.
Actually, what I'm interested in is how it affects my AdSense earnings. Though I understand the moderator's decision to move this post here.
I understand that toolbar PR is a snapshot and that by definition is not current data. I guess what I didn't make clear at all in my initial post is that it goes from 5 to 6 to 5 to 6 (etc) on the same day, on subsequent visits to the site. It seems that I get a few more 5s than 6s. It seems that wherever data center the toolbar gets it's data from shifts from page load to page load.
That said, it is just a hint "sticky", so when site a had a 6 site b has a 2 and site c has a 5 if I visit them consecutively... sometimes! Other times I get other results.
All the phenomenon aside, the question remains about PR and AdSense earnings; When it changed over to a 5 from a 6, my earnings went up, when it started to toggle back and forth 5 my earnings went down.
Traffic referred from Google has been very strong and stable, not changing much based on Toolbar PR, as you guys suggested.
It must be just one dc, as whenever I try to replicate it on another PC it shows a different value...
Our site has been PR 4 for a year now, it was once a PR 5 so I would guess with a few extra links we've received it would probably be pretty close to PR 5 now.
Another new site also started showing PR, but bounced back to 0 again shortly after.