Apple has just released OS X Mountain Lion 10.8.5 via Software Update. The update offers a number of fixes including ones for Mail, Xsan, and AFP file transfers. The full release notes:
The OS X Mountain Lion v10.8.5 Update is recommended for all OS X Mountain Lion users. It improves the stability, compatibility, and security of 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 an issue that may prevent a screen saver from starting automatically
Improves Xsan reliability
Improves reliability when transferring large files over Ethernet
Improves performance whe
