Frustrated. To my excitement, I purchased this display last week. In my previous thread, I posted that it looks stunning and works as it should. Well, last night I was using the display, then I noticed a color change on screen. Overall tone of the display turns "greenish" and turns back to normal. A few moments later it turns "cooler" then back to normal. The "discoloration" is for five seconds or so. And it's very irregular. I might be over-stating when I say discoloration, but the overall color changes back and forth. BUT not all the time. I thought my eyes were wrong. But the problem is, it's not a constant issue. If my screen was flickering or had distorted images I could understand that it's defective. The symptom that I just explained doesn't even happen unless I use it for hours. So these might be issues with this: 1. Running it too long. I've had the display on and was working on it for hours. But then, why won't I be able to use it for hours? Even if I had decided to keep the display at full blast for hours and days, this shouldn't happen. 2. 10.5.6 update. I have no conclusive evidence that the recent OS X update had to do anything to my mini display port and external monitor capabilities, but since some have reported issues with it, it could be the cause. I would hate to drag it down to a local Apple store to meet with one of the genius guys or ship it in for a repair/replacement. I already know what's going to happen at the Apple Store; one genius guy would ask what the problem is and after I explain it to him, he won't see the problem in front. And repair/replacement takes too long... Hope this is a fluke. Just some thaw out process for the display... Am I hoping too much? Damn.