Keeping up with its two-week release cycle, Apple on Monday seeded the third developer preview of its next-gen Mac operating system, OS X 10.9 Mavericks, with minor under-the-hood changes. According to people familiar with the latest version of Mavericks, the new build shows no major changes, meaning that only minor bug fixes and performance tweaks were made in the two weeks since the second developer preview was seeded in June. Apple has been on a two-week release cycle for both Mavericks and iOS 7 betas, the latter being seeded earlier.

The accompanying release notes suggest changes have been made to how Mavericks handles the forthcoming iCloud Keychain feature, as the seed is not backward compatible with iOS 7 Seed 2 or Mavericks Developer Seed 2. As such, users will need to re-enable the iCloud Keychain from the iCloud preferences pane after upgrading to Developer Preview 3.

Other issues which were already known include graphics problems when resizing or switching from standard to satellite view in Maps, file handling in Aperture and Photoshop, along with various small bugs. Finally, the notes point out that Fusion Drive volumes created in Developer Preview 3 are incompatible with OS X 10.8.4 or earlier.

Mavericks will likely bring a number of improvements and feature additions to current OS X 10.8 Mountain lion when it launches this fall. Features will include Finder tabs, Maps, App Nap and Compressed Memory, among several others. Developers can download the third Mavericks preview via the Mac App Store.

Source: Apple