I have a Slingbox Pro. It was connected directly to the coax cable from Cable One and things worked fine. Recently, Cable One turned off all analog channels and supplied an All-Digital-Device for an interface. I have now connected one drop of the coax from Cable One to the All-Digital-Device and connected the All-Digital-Device to the Slingbox Pro using a composite cable. I now get audio but no video. In the Slingbox web site, in setup, I have selected "Composite", but it has the notation (Unconfigured). Is the something I have to configure to get video using a composite cable?