Finally got my new Thunderbolt display today... and there is a distinct yellow tinge/cast to the bottom third of the display. It seems more prominent on the right-hand side, but what is crystal-clear white at the top of the screen is very dirty pale yellow on the bottom. I'm assuming this is not within the expected display parameters? I've searched but most people seem to have yellow tinge problems with 27" iMacs, not Thunderbolt displays. The display is being collected for return in a couple of days, but annoyingly I didn't get it via Apple and therefore have to wait 14 days for the return to credited, and then order a replacement. Damn! Anyone else had a yellow tinge problem?