I was visiting one of my sites that had grayed out Pagerank in the Google toolbar. I happened to also have the same website up on another computer which also has the toolbar installed. I noticed that the Pagerank was a 4 on that computer. Strange.
I went back to the first computer and checked the toolbar options. I turned off the pagerank and clicked "ok". Then I returned to the toolbar options and turned the pagerank display back on. Clicked "ok" again and then went back to the website. I now had a pagerank of 4.
I have two PC's on my desk one shows one set of results and the other another, I think they are just getting the wrong datacenters as www points to a different datacenter the cache pointer is still getting results form the last session in that browser.
What I noticed today is that when I go to a website from a SERP after doing a search, the pagerank is grayed out, bowever if I copy that URL I just went to, and paste it into a different browser window and go to that page from there, the page rank comes through just fine. That seems to be the situation I've noticed.
Heh...I was just about to post about almost this exact same thing.
I was out doing some link hunting for a client. Every single links page I went to was greyed out. I thought it was kind of weird. However, if I clicked on the "Cached snapshot of the page" link in the toolbar, it would show the cached page. Then, if I hit the back button. Voila...the pages PR suddenly showed.
I went to a backup comp. and went to the same sites and found the toolbar displaying the PR exactly as it should on every page.
I went back to my main computer and deleted all the cookies.
Now the toolbar is showing the PR on all the links pages again.