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I am facing a very weird problem with my MacBook Pro 15". I was working in Xcode 4.2 and when I option-click in simulator (to simulate multi tap) my keyboard stops working. The weird thing is that only the a-z and 0-9 keys are not working...

By the way I am using a bluetooth mouse... and recently updated my system to MacBook Pro EFI firmware update and I am running OS X 10.7.2 Lion.

I had to restart my system to get the keyboard functionality back.

Is this a bug in the OS? How can I get rid of this problem?

Thanks in advance

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Just got bit by this one myself! Glad I could find it on the site. –  Daniel Lawson Apr 15 '12 at 20:46
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2 Answers 2

Finally got it. I was pressing option keys lot of times and pressing it 5 times enables mouse keys (which disables keyboard keys).

To reverse, go to "Settings -> Accessibility -> Mouse and Trackpad" and uncheck "Press the option key five times to turn Mouse keys on of off" or simply uncheck "Enable Mouse Keys."

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Note: This issue (function keys only working) can occur using the Apple wireless keyboard with an iPad as well. Unfortunately, iPads don't have the same Accessibility settings mentioned above. Replacing the wireless keyboard batteries (thus powering it down completely) and disconnecting/reconnecting the keyboard connection did NOT have any effect correcting this problem. However, powering down the iPad completely seemed to do the trick; after cold boot of iPad, the standard keyboard keys were re-enabled.

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The question involves the iOS Simulator running on a Mac, not a real iPad. –  CajunLuke Jan 19 '13 at 19:35
    
Hence the use of the qualifying term "as well". I felt it worth pointing out given the similar domain (Apple), similar behavior, similar rectification, and lack of a more relevant question on which to answer at the time. I would have gladly left this info as comment-only, but don't have the requisite 50 rep. Sorry that you felt it was worth down-rating. –  Chuck Staples Jul 25 '13 at 21:06
    
That's a good reason. I rescind my downvote. –  CajunLuke Jul 25 '13 at 21:30
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