HT201341: About X11 and OS X
Learn about About X11 and OS X
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Helpful answers
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Aug 29, 2016 6:41 PM in response to Grant_Yby macjack,Hi Grant, try a simple restart and see if that gets it going. It's probably a corrupt SHA:
Mac OS X: How to verify a SHA-1 digest - Apple Support
If that doesn't help then try downloading and installing it in Safe Mode.