I noticed this about a month ago on CSN-Chicago. Exactly as volzjr described: Terrible blocking on any on motion scenes and in static shots, it would macroblock for a moment, and then "snap" into focus. This went away for about a month, when I noticed it again on Tuesday night during the White Sox game. [Nice to know Comcast/Dish doesn't discriminate between the Cubs and the Sox!
] I've never seen blocking this bad on an SD broadcast., let alone an HD broadcast.
I recorded the game and took some pictures of the screen which I will post later today after I get home. Not sure if this is a Dish problem or a Comcast problem. I'm on a single dish too.
Ray