With two nights of Grey's Anatomy on ABC, I noticed that the lip sync was out on my 622 both nights, just for that show - but no other station. It would start off ok and then I would see green blocks/pixels, and from there the lip sync would be off - that is both live and delayed viewing. If I rewind to a point before the green artifacts, the lip sync is ok and then after the lip sync would be off. I seem to only get lip sync problems on ABC. Very odd.