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: http://support.apple.com/kb/HT5815 For detailed information about the security content of this update, please visit: http://support.apple.com/kb/HT1222
To download the update, go to > Software Update, or open the Mac App Store and go to the "Updates" section.