OS X Yosemite: If a keyboard shortcut doesn’t work
See and change keyboard shortcut assignments in Keyboard preferences
It’s possible to have keyboard shortcuts for one app that conflict with another app. For example, Command-Space bar opens the Spotlight menu, but in another app it might be used for switching between different input methods.
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Choose Apple menu > System Preferences, then click Keyboard.
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Click Shortcuts. A yellow warning triangle appears next to conflicting keyboard shortcuts. Click the shortcut, then change it.
Last Modified: Sep 23, 2015