This is just like the HBO PQ "pulse" from a couple of years ago. You'd be watching some movies or shows and they would be macroblocking as a continuous pulse (blocky, clear, blocky, clear), it wasnt easy to notice but once you did it sucked. More and more people noticed it, and less and less said "I dont see it, its your system", then poof one day it was fixed...
65" VT50 / Oppo 103D
Denon 4520CI / Emotiva XPA-3
Klipsch RF82 II and RC62 II / Hsu VTF-15H (2)
Directv HR44-200 / HR24-500