First a report from Arthur:
I had a rather bad surprise couple of days ago when starting using my iMac Alu 20" received last Wednesday. Yesterday morning, while displaying a RAW photo with Lightroom, I was surprised by artifacts, similar to those seen on compressed JPEG with blue sky. Then I forgot about it. Till yesterday evening when I displayed a gray to white scale with Omnigraffle big shock! I obtained large stripes, with ugly sidesa disaster
So I decided to display a white to black scale, and photos below illustrate the astonishing result. On the white side, the first 5 centimeters on the left are entirely white:
And on the right, the last 5 centimeters are fully black:
And in between one can see those vertical stripes of 1cm with ugly sides.
