updated 09:50 pm EDT, Tue April 29, 2014
No new changes or significant issues noted as testing continues
Eight days after the previous release, Apple has now made available a ninth beta of OS X Mavericks 10.9.3 for developers -- and now, other registered users -- to test, with the same focus areas as the previous release and again with no issues noted. As with last week's version, the primary difference in the new build is the build number, 13D55. This is ten units higher than last week's release, suggesting that a subtle fix for something has been implemented and tested.
As before, the company 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. Also introduced in recent builds is preliminary support for pixel doubling for 4K external 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. New testers who have signed up for the public Beta Seed Program, signed the required confidentiality agreement, and downloaded the associated Beta Access Utility can obtain the latest build from the Mac App Store. Apple cautions new testers that betas are not intended to be run on production machines, and may be unstable.