I have a late-April Penryn 15.4inch MBP, which has some weird screen characteristics. In the bottom 1/3 of the screen, but especially in the bottom left corner, there is almost no contrast between white and certain very light colors. Additionally, colors appear dimmer in this corner, but let's focus on the following: When I do the following: (please do this experiment too on your MBP, I'm curious) -Open itunes and look at the alternating blue and white bars of your media playlists -or- -Open up the standard gmail interface, and look at the alternating blue(read messages) and white(unread messages) bars In the bottom left hand corner, these bars all look white. You can't tell that there are blue bars at all. I have seen this happen with light pink as well. I took my MBP back to the store and demanded an exchange since it was so new. The Genius walked with me around the store, and together we found that every single Macbook Pro had the same problem. None of the iMacs, cinema displays, macbooks or macbook airs shared this fault, but every single macbook pro included the 17inch HR version had it. Unless you tilt the screen back, which puts the rest of the screen out of its viewing angle, the alternating bars converge into white at the bottom left of the screen. Since this seems to be some kind of inherent flaw, I just left the store not knowing what else to do (quit the mac?) and after the manager came out and told me there was really nothing he could do besides offer me a refund. Please let me know if you have the same problem.