The EBS Administration Console may crash if illegal characters are present in devices reported back to WSUS and SCE. The symptoms are that the console will fail to launch, and C:\Program Files\Windows Essential Business Server\logs\AdminConsole.log will have a line similar to “System.Xml.XmlException: '', hexadecimal value 0x01, is an invalid character”. (If you don’t see this exception, this article does not apply).
To allow the console to load properly, it is necessary to identify the problem machines, edit the bad value, and then report back to WSUS.
Full Article: EBS Team blog