It could be. I don't have another HDMI capable TV to test that out. Any hypothises on how that might occur? I don't remember what resolution the blu-ray player's splash screen was being displayed at. I did try messing with the player's vid settings using 'auto' and forcing '1080p' with and without 24 fps set. The laptop displayed at something like 1200x700(ish). I set the Xbox 360 to 1080p and did not try any other settings.
I have also not checked if the TVs firmware is up to date.