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The latest update, people familiar with the matter say, narrows the focus areas down to three: AirPort, GraphicsDrivers and QuickTime. Focus areas in included last week's build, iCal and Printing, have reportedly been eliminated.
All three builds include an update to QuickTime X that, when finalized, will improve security and compatibility while simultaneously enhancing overall reliability. The betas will also include tweaks that aim to enhance the performance of Apple's 64-bit Logic pro audio suite. Other bundled improvements include better compatibility with third-party printers and OpenGL-grounded applications.
Build 10D552 reportedly has no known issues listed by Apple. The download weighs in at 737.2MB. It is the fifth beta release of Mac OS X 10.6.3.