Apple Wireless Keyboard brightness keys not functioning since 10.8.4

Hey all,
since the new update, I've been experiencing several malfunctions, among which the two brightness keys on the Apple Wireless Keyboard. Every other key seems to be working as usual.
I tried resetting the P-Ram, but nothing changed.
Any hints?
Thanks,
Z
Setup:
MacBook Pro 13", Apple Thunderbolt Display, Apple Wireless Keyboard, Apple Trackpad

Reset the SMC > http://support.apple.com/kb/HT3964
If it doesn't work, reinstall OS X 10.8.4 through the Combo edition > http://support.apple.com/kb/DL1659 This will reinstall everything which was updated in 10.8.4, so it should fix this issue

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