The 10.7.1 update is recommended for all users running OS X Lion and includes general operating system fixes that enhance the stability and compatibility of your Mac, including fixes that:
- Address an issue that may cause the system to become unresponsive when playing a video in Safari
- Resolve an issue that may cause system audio to stop working when using HDMI or optical audio out
- Improve the reliability of Wi-Fi connections
- Resolve an issue that prevents transfer of your data, settings, and compatible applications to a new Mac running OS X Lion
- Resolve an issue where MacBook Air may boot up when MagSafe Adapter is attached
- Resolve an issue causing intermittent display flickering on MacBook Air
- Resolve an issue that causes the SD card slot in Mac mini to run at reduced speed with SD and SDHC media
For detailed information on this update, please visit this website: http://support.apple.com/kb/HT4764.