Hey i found i fix that worked for me!
Turn off your computer entirely, wait until the screen is black then turn it back on. While you press the power button hold down command, control, "P" and "R", until you are back in your desktop. Then it should work.
I'm on beta 8 so I don't know if it will work for everyone.
hope this helps
GabrielSchneider1
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I've had the same problem since this morning, anyone have a fix?