Apple issues OS X 10.9.3 beta to developers with minor tweaks

Apple's latest version of the upcoming OS X maintenance update, dubbed build 13D45a, is the eighth seed since the first OS X 10.9.3 beta was released in March. Build 13D45a comes six days after the previous version was pushed out.

According to the accompanying seed notes, Apple is looking for feedback on Graphics Drivers, Audio, Mail, Safari and iTunes contacts and calendar synchronization.

Prior betas of the upcoming OS X 10.9.3 Mavericks brought support for pixel-doubling scaling, suggesting the update will introduce a so-called "Retina" output mode for late-2013 MacBook Pro with Retina display connecting to external 4K monitors

Developers can download the build 13D43 from Apple's Developer Portal or via Software Update.