Currently Being ModeratedAug 21, 2013 10:50 PM (in response to Scott Herman)
Try a Safe Mode boot...
Startup your Mac in Safe Mode
A Safe Mode boot takes a longer than a normal boot so be patient.
Once you are in Safe Mode, click Restart from the Apple () menu.
Then try the keyboard.
A Safe Mode deletes some system caches that may help, especially after an update.