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My drops directly from HD to the Tivo Central menu after 5 or 6 minutes also. Non-HD content seems to work better.
Cox in Rhode Island does have M cards, but I haven't been able to get them to install one in a Tivo. I know they are available because they are...
The Tivo rep I spoke to indicated that the Crestron enabled control would be IP based, and that it would only be on the Series 3 box.