in the last few weeks I've noticed my media keys are no longer working to control iTunes (F7, F8, F9). Ive checked the keyboard settings in system preferences and the "use keys as standard function keys is unchecked" box is unchecked (when i do check the box and press the keys concerned i get the alert sound, so the keys are working). I've checked it with VLC and doesn't work on that either. Can you help me get these keys to control my iTunes again please? Thank you.