Mac OS X 10.7.4

Mac OS X 10.7.4 was an update to Mac OS X 10.7 (Lion) released on May 9, 2012. It contained the following updates:
 * Resolved an issue where the “Reopen windows when logging back in” setting is always enabled
 * Improved compatibility with certain British third-party USB keyboards
 * Addressed an issue that could prevent files from being saved to a server
 * Improved the reliability of copying files to an SMB server
 * Adds support for the Apple Thunderbolt to FireWire Adapter and Thunderbolt to Gigabit Ethernet Adapter.

External References
Apple: OS X Lion Update 10.7.4 (Client)