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Apple on Tuesday seeded the latest version of its OS X 10.9.3 Mavericks beta to developers with minor changes, asking testers concentrate on the usual built-in features including graphics and Mail.
Focus areas for build 13D55 include graphics drivers, audio, Safari, Mail and Contacts & Calendar syncing over USB in iTunes. These are the same areas of interest noted in Apple's previous beta issued last week.
Past betas of the upcoming OS X 10.9.3 Mavericks supplemental update brought support for scaling that doubles pixels for 4K monitor output, suggesting the update will introduce a so-called "Retina" output mode for late-2013 MacBook Pro with Retina display.
Developers can download the build 13D55 from Apple's Developer Portal or via Software Update.