This unit was delivered yesterday. As I was watching this movie during an action scene, the picture became distorted (little squares/pixels)and seemed to clear up after a second. What is calibration? Do I need this? I don't know too much about this issue and was hoping to get some feedback from all of you experts.. I'm trying to not be bummed about my purchase and hoping its just a minor issue that can be fixed.. They only thing I did to this tv was plug in the HDMI cable to my Fios box.