Thanks for the replies.
I'm gonna try to swap one of my HD boxes for this one to see if that helps. What kills me is that if I swap one set of cables the HD will work for about half an hour. I'll report back.
Biker, the verizon guy checked the signal strength out of the coax coming out of the wall. He had some kind of giant handheld PDA thing.
One more thing about my TV, I get all my channels via the "component" input. I cycle (via input) through CATV, input 1, input 2 and component. Only the HD channels won't work. regular channels work and look like always. Don't know if that matters, but I thought I'd share.