Hi,
I'm aware of the issue with the rating and paging but have not seen a related viewstate error.
The problem is we are doing the paging inside an UpdatePanel and the rating controls don't get initialized as they should when you page because of the way the update panel re-renders just part of the page. I have an idea in mind for a solution to eliminate the UpdatePanel which would solve this. Hopefully I can get to it within the next few releases.
Best,
Joe