howdy everyone. i just got a nook color and noticed that there is a very, very faint light grey smudge (a 2" half-circle near the center-left) underneath the screen. i can only see it when the screen is all white; it's not really visible when there's text or other colors going on. i suppose my question is, does anyone else's nook exhibit this? if not, do you think it'd be worth exchanging for another one? thanks
