Cannot adjust display brightness via F-keys nor Preferences

After updating Mavericks to 10.9.4, I cannot adjust the display brightness. Using the F1-2 keys will show the brightness icon that usually pops up. However, it's stuck and nothing happens when I press either F1 or F2 (the brightness keys).
I tried going into Preferences and adjust the brightness from there. "Automatically adjust brightness" is not checked and when I drag the slider, it slides back to where it initially was.
How can I fix this problem?
Thank you in advance,
Filip

Hello Gnazty,
Thanks for using Apple Support Communities.
I'd like you to reset your SMC and PRAM as the articles below describe:
OS X Mavericks: Reset your computer’s PRAM
http://support.apple.com/kb/ph14222
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT3964
Take care,
Alex H.

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