I upgraded my iMac to 10.9.4.  Now the feature where you can go to 4 diff. screens (Command+Control) doesn't work.  How do I fix this?

I upgraded my iMac to 10.9.4.  Now the feature where you can go to 4 diff. screens (Command+Control) doesn't work. 
How do I fix this?

Do you have that problem when running in the Firefox SafeMode? <br />
[http://support.mozilla.com/en-US/kb/Safe+Mode] <br />
''Don't select anything right now, just use "Continue in SafeMode."''
If not, see this: <br />
[http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+themes]

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