MacBook Keyboard Works Intermittently After Upgrade?

Suddenly experiencing occasional keyboard 'outages' on my MacBook. Seems to occur after waking from sleep. The keyboard will work then stop for a minute then work again. Trackpad continues to work.
Anyone else seen this? No 3rd party keyboard or mouse software installed.

Had the same problem. Fixed! Here are the steps:
1) shutdown system
2) boot with while holding down shift key (safe mode)
3) launch Finder | Utilities | Disk Utility
4) select Macintosh HD (your system hardrive)
5) click on "Repair Disk Permissions" (this will take a while)
6) restart system
While waiting upon 5, I notice that my keyboard was working fine in safe mode. Not sure is steps 1,2,6 are needed; it could be that steps 3,4,5 are all that you need.
Mileage may vary. Please post your results. Many thanks to the Apple technician (for case# 86941514) who solved my problem. I was so not looking forward to sending in my macbook, like someone else with this problem has done.

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