The Retina screen on my late 2013 15in Macbook started showing weird horizontal and vertical lines out of the blue, so I took it to Apple and they replaced the screen. But when I got it back, something is off with it. It does not look the same. It's like it's lacking contrast, has a weird dull tint to it. It's lacking tons of clarity. It also seems like the screen can't keep up with movement. Like it's always behind. I type a letter and it's slow to show on the screen. It's barely noticeable, but it's happening and I'm not crazy. It's not lag like when your computer starts slowing down. It's more like visual lag. Like the refresh rate is slow. I didn't think anything of it and thought it was just a new screen and was better, but I do color-correcting and now when I proof my images they are always off when they shouldn't be because I color-correct tens of thousands of images on this screen and the only change is the new screen. My wife has a late 2014 15in Macbook pro and I wanted to compare them and sure enough, there is a tad bit of difference. Her's looks how mine used to look and mine is now washed out with a yellow dull white point. She says she barely notices it, but I certainly do and it's messing with my work. My previous screen was calibrated and had it's separate color profile so I thought that could be it, but I changed my color profile to the same default one as my wifes and there is a difference between the two. Is this normal? Here's some pics. My new screen on the left, and my wifes normal screen on right. Note the red in the cat and the yellow in the iPad. Here is the display screen where I show we both are using the same color profile. Even the retina display options box has a weird yellow washed out tint to it on mine on the left. My wifes on the right is how my old monitor was. It's missing tons of clarity. I've mirrored all options on both displays, but I can't get mine to look the way it used to. What is going on? Is it possible Apple uses lesser quality parts in replacements? It's barely noticeable, but since I work with color all day it's extremely noticeable to me and when I am working images, what looks right on my screen ends up proofing out incorrectly.