I recently purchased a Roamio Plus to replace my dying S3 (intermittent HD problems). I thought I'd be able to just swap it into my existing configuration and keep going, but no such luck.
I have my source devices all going through a 4 x 2 HDMI matrix switch so I can route any of them to one of two TVs and it has never been a problem. It has worked with every device I've connected, including my S3 Tivo, for the past 3 years. The Roamio Plus is the first device that refuses to send signal through the switch to either TV. I can successfully directly connect the Roamio Plus to either TV and I have eliminated particular cables and ports on the switch as the culprits.
Has anyone found an HDMI matrix switch with at least 4 inputs (5 or 6 would be even better!) and at least 2 outputs that plays nice with the Roamio? It seems like the problem may relate to particular HDMI specs or EDID settings, but I'd really like input from a Roamio owner who has had reliable success before I just start buying devices hoping they will work.