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Random code in TextEdit window open after reboot

After rebooting my MacBook Pro (Mid 2012) running OS X 10.11.1 Beta (15B30a), I now see this TextEdit window with random code/text in it. Why is this happening and how can I stop it? Does it have to do with running the Beta?

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MacBook Pro, OS X El Capitan (10.11.1)

Posted on Oct 30, 2015 9:16 PM

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Random code in TextEdit window open after reboot

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