I got my replacement receiver last night and it fixed the problem. I can now record two things at once. The only problem is they sent me a refurbished HR20-700. I guess I can deal with it though because there's probably not much I can do.
So now once I get the correct 6x8 switch installed this weekend I'll be all set.
1. Refurbished = works
2. New = don't work
I had the same experience as you and am glad I got to option 1 after the experience of option 2...