This was partly answered by this related question.
http://answers.splunk.com/questions/510/error-savedsplunker-no-record-for-that-user
What I want to know is how do I identify what saved searches are causing this. How can I determine the specific saved searches without going through each and every saved search?
Change the logging level of SavedSplunker to DEBUG. That's how I tracked down which searches were causing problems.