Macbook Pro (Retina, 13-inch, Late 2012): Subtle White Lines May Appear In Mission Control
A new Apple Knowledge Base article says that when you use Mission Control on your Macbook Pro (Retina, 13-inch, Late 2012), you may notice a few fine lines appear on the desktop.
To resolve this issue, Apple says you should install the latest Mac OS X updates for your computer. See OS X: Updating OS X and Mac App Store apps for instructions.
For more information, visit:
http://support.apple.com/kb/TS4399???
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