The OS X v10.8.5 Supplemental Update is recommended for all users running OS X Mountain Lion v10.8.5.
Resolves an issue that may prevent certain applications from using the FaceTime HD camera on mid-2013 MacBook Air systems
Fixes an issue that may cause external drives to be ejected after the computer goes to sleep
Addresses an issue that may prevent HDMI audio from working after waking from sleep
Fixes an issue that may prevent certain USB Bluetooth adapters from working
For information on the security content of this update, please visit: http://support.apple.com/kb/HT1222