10.8.4 Screen Brightness Keys No Longer Work

I ran updates this morning and I assume it updated to 10.8.4 from the app store updates tab.
After this update and booting back up the screen brightness keys no longer work. F1 and F2 keys do nothing and they worked fine before the update.
Anyone else experiencing this? If so know a way to fix it?
Thanks
Patrick

I have been having the same issue and even with updates have continued to have the problem. I was able to find a chck box under the keyboard settings that I never noticed before. When checked it only allows you to use the function keys on the top of the keyboard when pressing the fn (function) key. Simply unchecking this (not sure how it got checked in the first place) solved the issue immediately.

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