I am starting to wonder if I'm the only one who has a yellow screen (tinted yellow towards the bottom, going away as you get to the top). Even with calibration its a bit noticeable with an all white window (like Safari). My 2011 iMac showed none of this. My Apple LED Cinema Display shows the issue a little (and has for years) but the new 27" 2012 iMac is worse. I will likely get it replaced; just waiting for some more parts and machines to make it into the channel so I don't have to wait long for a fix.