Dev guys and gals, still there? Apple has just pushed out OS X 10.8.3 12D76, the thirteenth beta release of this Mountain Lion maintenance release — our canine informant is pretty sure that’s some kind of new record. Anything remarkable inside? Just another iteration of “no known issues.”

Knowledgeable canines say that little is known about this latest incremental Mountain Lion update beta other than that OS X 10.8.3 12D58 12D61 12D65 12D68 12D74 ETC 12D76 arrives with no known issues and that testing should focus on AirPlay, AirPort, Game Center, Graphics Drivers and Safari — BOILERPLATE.

New apps in OS X 10.8.3 will include Safari 6.0.3 and Mail 6.3. The install size is substantial at 500-plus megabytes for the delta while the combo weighs in at a generous 800-plus megabytes.

Additionally, knowledgeable pups say OS X 10.8.3 12D65 fixed the File:/// bug and that, our doggie deponent has confirmed, remains true in this seed.

Compiled from notes provided by Scruffy the Feature Retriever who is known to read MacRumors, AppleInsider and 9 to 5 Mac. He also trolls the forums on the dark side of the fairer platform and has an affinity for Black Blood of the Earth shooters.

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