I got a NSZ-GT1 two weeks ago, it worked fine when connected from Comcast STB and Shart tv, but when I added the my home theater receiver, as shown in the "Quick Start" guide, the live tv stopped working. Four hours of tech support later, and after several technician attempts at "System Restore", I gave up, returned the GT1 (assuming it was bad) and got another one. This time I hooked it up with Comcast STB and home theater at the start - same failure - live tv didn't work - continuing cycling from good picture to green screen to black to white "noise" to black again, then back to good picture, every 10 seconds. Several tech support calls later, I reach Tier 2 agent in San Diego who says it my STB blocking a double-hop HDMI connection (security feature) - call my cable company and have them "fix" it. So I call Comcast, and learn that they have a tech note that the agent read to me (from Oct. 15 2010, but reportedly the "latest" note they have re the GT1) saying that there are no Comcast STBs that supports the double-hop HDMI configuration recommended by Sony...!!!??? Spoke with Sony San Diego tech agent again, he says he personally knows of GT1s working with Comcast customers...so who's right??? Can this be true? Can Sony have failed to make this work with Comcast? If so, why don't they publish that, and why isn't there chatter here about that? If it's not true, how can I get Comcast to give me a STB that works with double-hop HDMI set up? Thanks for any advice you can share!