My boss' 2012 iMac is on 10.10.3 His bluetooth keyboard is not responding correctly to the function keys (e.g. volume, dashboard, brightness, etc.) In addition, the 'Use all F1, F2, etc. keys as standard keys' is missing in the keyboard settings under System Preferences. When I plugin my wired keyboard all the keys work as expected, which leads me to think its a bluetooth driver issue. Is there a file I can replace or somehow fix this? Thanks!