In an unusual move, Apple has seeded a new build of OS X 10.8.3
to developers just two days
after the previous version. No explanation was given for the new build, 12D44 (just one build higher than the previous one), and the release notes on the build are identical to the one given out on Tuesday. The new version becomes the fourth beta of 10.8.3 and the third sent out so far this month. Given the identical release notes, it is possible that the new build simply fixes a discovered flaw or vulnerability in the previous build.