SSRS 2005 Issue: ‘Method not Found: CleanCurrentUserName()’ and ‘Report Server is not responding’

I’ve been researching an issue today relating to a problem with SSRS 2005, the symptoms are as follows; 1. “Report server is not responding” error in the browser when connecting to the Report Manager website.2. The following message in an ASP.NET entry in the application event log on the server:      Exception information:        Exception type:…