I just upgraded to a 15" rMBP from an order MBP. Very happy with everything accept I am having problems with the integration with the 27" Thunderbolt Monitor. If I plug into the monitor in clam shell mode, the screen does not adjust to the 27" monitor scale. Essentially I get the 15" rMBP sizing/scaling on a 27" Monitor. It is very difficult to see. If I change the resolution of the monitor it makes the screen fuzzy/blurry. I have plugged the rMBP into a 24" Cinema Display and it works perfect. The sizing/scaling adjusts. It seems like there is a communication problem between the rMBP and the Thunderbolt Monitor. Anyone experience this? Any solutions? Thank you in advance.