The process of internal testing of OS X Mountain Lion 10.8.3 Beta made some progress later today when Apple released another Beta build of OS X Mountain Lion 10.8.3 (12D54) later today. This new build of OS X Mountain Lion 10.8.3 (12D54) was released after the preceding build of OS X Mountain Lion 10.8.3 (12D50) earlier this month. This new OS X Mountain Lion 10.8.3 (12D54) doesn’t bring something new or got no issues fixed because there were no known issues in the preceding builds.

The main area to focus on this build is the same as it was in preceding builds. Apple has asked the developers to focus mainly on AirPlay, AirPort, Game Center, Graphics Drivers, and Safari along with Wi-Fi.