After installing ArcGIS viewer for Silverlight, I launch the viewer as directed in the quickstart guide: go to Start/Programs/ArcGIS/ArcGIS Viewer for Silverlight 3.1/ArcGIS Viewer for Silverlight 3.1. The page loads and shows Downloading @ 100%. I never see the application builder. Any ideas on what might be causing this? I am using IIS version 7. All of the other prerequisites have been met.