Apple released a supplemental update for OS X 10.8.5 to address four issue in Mountain Lion, including a FaceTime HD issue (that also affected Skype on mid 2013 MacBook Air), an issue effecting external drives, a problem with HDMI audio, and an issue affecting USB Bluetooth adapters.
The patch notes for OS X Mountain Lion 10.8.5 Supplemental Update:
The OS X v10.8.5 Supplemental Update is recommended for all users running OS X Mountain Lion v10.8.5. This update:
- 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
The update is available in the Mac App Store. A standalone update is available from Apple's support site as an 18.74MB download.
There is also a combo standalone updater, but, as of this writing, that page still lists the original 10.8.5 combo updater without the Supplemental Update.