Do a search here for "NBC pixelation", and you'll find a lengthy thread about this problem in a few cities. It's a problem between the local station's feed and DirecTV's equipment that affects a few HR34 Genie DVRs (is that what you have?). Supposedly DirecTV is aware of the issue and working with those stations on a fix. But it's taking a long time. Some folks have "fixed" it by getting DirecTV to replace their HR34s with an HR44 Genie DVR.