A week following the previous build, Apple has seeded build 12F20 of the upcoming OS X Mountain Lion 10.8.5 release to developers.
As with previous builds, Apple says there are no known issues, and the company asks developers to focus on WiFi, Graphics, Wake from Sleep, PDF viewing and accessibility, and Mobile Device Management.
The update is available for developers with older builds of 10.8.5 installed via Software Update in the Mac App Store. It is also available via the Developer Center.
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