Apple today released OS X 10.7.4, the fourth maintenance update to OS X Lion. The update is currently available via Software Update and should appear on Apple's download pages soon.
The 10.7.4 update is recommended for all OS X Lion users and includes general operating system fixes that improve the stability, compatibility, and security of your Mac including fixes that:
- Resolve an issue where the “Reopen windows when logging back in” setting is always enabled
- Improve compatibility with certain British third-party USB keyboards
- Address an issue that may prevent files from being saved to a server
- Improve the reliability of copying files to an SMB server
Detailed information is available in the full release notes.
Source: Mac Rumors