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Question: Picture Delay

I notice a significant delay in the picture being sent to my TV when changing stations. Sound comes through pretty quickly but the picture is delayed about 5 seconds. I sometimes get a Weak Signal message (I notice this most when changing between HD and Digital - Cox cable). Once the picture is there, it looks great. Is this part of the "upconversion"? Is this common? I run HDMI from BD and DVR to 1120 and HDMI out to TV (Samsung LCD). I also have a Wii comming in on the DVD inputs and out through HDMI.