Apple is preparing a supplemental update for OS X 10.8.5 to address several issues with FaceTime HD cameras on the company's latest MacBook Air models, external drive handling, HDMI audio, and USB Bluetooth adapters, reports 9to5Mac. The update, which arrives as Build 12F42, has been seeded to Apple employees and should be making its way to a public release in the near future.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 afte