Had the same problem Saturday night at a client's house. Perfect reception thruout the 3500sq/ft home. Now it's time to demo the system. Poof. Everything works but the SciAtlantic 8300HD box. Then just that emitter (to the cable box) STAYS on and I havn't done any discrete routing.

Shortly thereafter, the the entire RF is RalFing. The RF sniffer is going nuts. I called it the night and set it all the IR untill I can go back with my hair glued back in. It's a $5k job with a $100 problem.

I'm pretty good at this stuff by now with over 200 850's out there that work all day. Is this place built over an ancient indian burial ground? And why would that really matter??