The Supplemental Update was previously seeded to employees in late September with a build number of 12F42; the new seed has a build number of 12F45.
The OS X 10.8.5 update fixes issues related to the FaceTime camera on some mid-2013 MacBook Air models, as well as problems with external drives, HDMI audio, and USB Bluetooth adapters. OS X 10.8.5 was originally released in mid-September.
The FaceTime camera issue in particular has been the subject of a number of complaints, with Skype issuing a notice acknowledging the problem.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 for iTunes, version 11.1.1, fixes issues with deleted podcasts and iTunes Extras. iTunes 11.1 was released last month alongside iOS 7The 10.8.5 update updated a CoreMediaIO plugin that accesses the MBA camera, but didn't bundle the 32-bits version of it.
Other (older and newer) versions of the OS do include a universal version (32 and 64 bits), but not 10.8.5.
This means 32-bits apps such as Skype or iMovie cannot load the plugin, making the built-in facetime camera invisible to these them.
Internal releases of Apple software updates to employees typically signal an imminent public release.
Article Link: Apple Employees Testing Prerelease iTunes 11.1.1 and OS X 10.8.5 Supplemental Update