I noticed that one of my blogs has lost its PR in the last 2 days which is strange because i do not see any change anywhere else it has gone from PR3 to NA the only change that i have made recently is a theme change on my wordpress site could this affect my rankings,it even shows NA when i check it with PR checking tools,all my other sites are still the same and i am not ware of any PR update from Google,has anybody else experienced the same any info would be appreciated
Well, Google changed the call URL for page rank, so I don't know what tool you are using to check your PR, but I wouldn't worry about it. Your PR is still there, use the official Google Toolbar to check your PR.
Google change their API server. So use google pagerank toolbar to check your PR. I hope your PR is still there. or use _hxxp://ipagerank.info to check.
I have the same thing happen, and I know few others in the same boat - as linksboy stated, Google changed their API server.
Perhaps your PR lost is because you don't try to evaluate your seo performance and update the content
The valid reason is "Google change their API server." few of my add on show me na status for google pr, if i checked with other sources it will show. So do not worry about it.