I have a TiVo HD box (not upgraded yet) and a Samsun HP-T4254 plasma TV. I'm using a HDMI cable and I have no other components attached. I got them at the same time, so I've never really run one without the other. When changing channels their is a longer lag time then I'm used to (with my old Series2 and as standard TV) , and the screen is blank (grey) and flickers once or twice before the new channel comes up. It's slightly annoying. I've gone through all the menu settings on both the TiVo and the TV. Anyone else seeing this with the TiVo HD box?