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Apple has released another build of the upcoming OS X 10.8.4



From MacRumors:
Apple today issued build 12E30 of OS X Mountain Lion to developers, eight days after the first beta of OS X 10.8.4 was released. The first build asked developers to focus on Wi-Fi, Graphics Drivers and Safari, with no issues mentioned.
  Apple Seeds Build 12E30 of OS X Beta 10.8.4 to Developers