Yeah, I plan to try her dct6414 III out sometime this week, when I get a chance to borrow it for an hour or two. I will post my own results when I get a chance to do so.
Now that I read that you are seeing this with the DCT6412 III, i'm not holding high hopes that it will solve my problem, but still worth a try.
I did not mention this before, but I have another hdmi device (information of which can not be disclosed unfortunately), which does not exhibit these band issues that the comcast motorola boxes to on my sony wega, which is why I am hesitant to blame the fault on the TV itself.
also if I do 720P from DVI out of my macbook pro and watch HD content, I don't get these bands either.