I'm sorry if I just missed it, but are there any resources here for macroblocking or tiling? I did a general search and found scattered posts, but I wonder whether it's an issue ever covered in one place. I just bought a new tv and I've been noticing considerable macroblocking on HD channels. I'm trying to figure out whether it's the tv or directv. I have an HR20 hooked up through hdmi. It's most prevalent in action scenes or quick cuts. I watched a movie last night on hbo hd and ever flash of light or explosion looked like a jigsaw puzzle. Another place where it really shows up is on discovery hd -- there is a commercial where they show off their 1080i theater, and it involves lots of quick cuts and stuff. It looks very noticeable. Are there any fixes to try or things folks have done that make it better? Could it be hardware? Cable? I'm assuming this is not a problem with the television -- maybe even the opposite -- maybe the fact that I have a good 1080p tv is pronouncing an existing issue. By the way, I temporarily hooked up my tivo hd dvr to the same tv and saw the same problem.