We upgraded our installation yesterday and noticed that all builds using TFS are hanging at the "Checking for changes" step. The builds never seem to error out or stop. They just display a red box with the message "Failed to start build #35524 on SERVER NAME" and when you click on details » the message says "Cannot start build runner". If I go in to Edit the Configuration and test the source control connection, the graphic just spins and never resolves. (see attatched). All of these builds worked before the upgrade.