Apple has just released OS X Mountain Lion 10.8.1 for public download.
This update includes general operating system fixes that improve the stability and compatibility of your Mac, including fixes that:
● Resolve an issue that may cause Migration Assistant to unexpectedly quit ● Improve compatibility when connecting to a Microsoft Exchange server in Mail ● Address an issue playing audio through a Thunderbolt display Resolve an issue that could prevent iMessages from being sent ● Address an issue that could cause the system to become unresponsive when using Pinyin input ● Resolve an issue when connecting to SMB servers with long names ● Address a issue that may prevent Safari from launching when using a Proxy Automatic Configuration (PAC) file ● Improve 802.1X authentication with Active Directory credentials.