Just shy of a week after the last release
, Apple has issued its seventh beta of the forthcoming maintenance release, 10.9.3, to developers. As before, the new version lists no known issues, and asks testers to focus on any remaining issues with graphics drivers, audio, Mail, Safari, and the re-introduced feature of local syncing
of Contacts and Calendar data through iTunes to local devices. The new build, 13D43, also includes preliminary support for pixel doubling
on 4K displays.
The feature, a bonus for owners of the latest MacBook Pro models, effectively brings "Retina" screen quality to existing 4K monitor support, as well as expand the number of potential brands of monitor supported. The pixel-doubling will likely expand to other machines in future releases. A final release date is unknown, but those with registered developer accounts can obtain the update through the Mac App Store's Software Update or the Apple Developer portal on its website.