Apple releases OS X 10.8.5 with fixes for several bugs

Apple has released OS X 10.8.5, an update to Mountain Lion that fixes file transfers over 802.11ac and an issue with getting screen savers to start, among other things. The full release notes:

The 10.8.5 update is recommended for all OS X Mountain Lion users and improves stability, compatibility, and security for your Mac. This update:

  • Fixes an issue that may prevent Mail from displaying messages
  • Improves AFP file transfer performance over 802.11ac Wi-Fi
  • Resolves and issue that may prevent a screen saver from starting automatically
  • Improves Xsan reliability

For detailed information about this update, please visit: For detailed information about the security content of this update, please visit:

To download the update, go to  > Software Update, or open the Mac App Store and go to the "Updates" section.

Joseph Keller is the former Editor in Chief of iMore. An Apple user for almost 20 years, he spends his time learning the ins and outs of iOS and macOS, always finding ways of getting the most out of his iPhone, iPad, Apple Watch, and Mac.

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  • Good, that explains why my screen saver wouldn't start from to time, and prevent my MBP from locking itself automatically. Very glad it was just an annoying bug and that it got fixed.
  • They had an update in there for the drivers for my printer. Hoped it would cure the inability for it to always print with the desired settings and print with default settings at random regardless of the settings being set to the defined ones that I wanted. Sadly I still have the same problem, costing me a fortune in ink compared to printing on my old windows PC's. Might be worth purchasing another make of printer and hopefully that will cure the problem.
  • "Fixes an issue that may prevent Mail from displaying messages" <- Yes please!
  • I did the upgrade to 10.8.5 and now I can't watch any Youtube videos on my computer. Anyone know how to fix that little predicament? Thanks!