I had rather a traumatic time earlier today. Although I bought my ATD a week ago, it hadn't been used for more than thirty minutes at any one time until today. Imagine my horror this afternoon when a massive patch of condensation appeared on the inside of the glass. This lasted for around 45 minutes in duration and gradually cleared by which time I'd reported it to my local Apple Store and logged a case with AppleCare. It is now fully clear - Apple said they have had numerous instances of this in 27" ACD, iMac and ATD screens - always on new ones and that it soon clears. I'm not taking it any further at this point as it is now clear, but should it happen again I'll be looking for a replacement display. Has anyone else had a similar experience with a new Apple display? All is now well thank goodness.