All of the sudden no one can get to their profiles in our SharePoint 2010 Enterprise environment. A lovely unexpected error message pops up. Comparing the correlation ID with the ULS logs, it appears that the web application pool account is trying to access the Search_Service_Application_DB_GUID db. It has never needed this before, and clearly doesn't have it now. Any ideas as to why it's trying to use this account? Does anybody have their web application pool account with any permissions on this db?