I just switched from DirectV to dishnetwork 10 days ago. And since then I've had this same issue with Bravo HD. I've had the installers come out 4 times, and I told them it was fine in CNN HD (same sat same transp) but they kept moving around the dish and testing it etc etc.
After the fourth visiting (and well over 10+ hours of work) they finally reasoned it out and figured it HAD to be the uplink problem. So, they called Dish and reported the problem.
So, I'm switching to SD BRAVO for now, but one of my receivers has a TIVO connected to it and I can't figure out how to tell the receiver to go to SD version of Bravo (129) when it punches in 129.
FYI, I live in Central Florida...do the others that are experiencing this live in florida too? Let me know if it gets any better for you...I'll do that same..