Apple Seeds OS X Mavericks Preview 3 To Developers


Following the release of the iOS 7 beta 3 this morning, Apple has also released the third preview of OS X 10.9 Mavericks to developers this evening. The new preview comes two weeks after Apple released the second beta for Mavericks.

The ┬ánew release doesn’t contain any major new features, but focus mostly on bug fixes and performance. In an email to developers, Apple encourage beta testers to: haven’t discovered any major changes in the Mavericks preview 3 yet,

“Take advantage of new features, like APIs that optimize the new energy saving technologies in OS X Mavericks, as well as new AV Kit frameworks, Sprite Kit, Map Kit, and many powerful additions to existing frameworks.

Here are the release notes:

Notes and Known Issues


  • Network migration from earlier versions of OS X requires the Migration Update for Snow Leopard, Lion, or Mountain Lion, available from the Mac Dev Center.
  • Migration from Windows is not supported in Developer Preview 3.
  • Reinstalling Developer Preview 3 from the Recovery Partition is not supported. Developer Preview 3 can be reinstalled using a Time Machine backup or Target Disk Mode.

iCloud and iCloud Keychain

  • The Reset Keychain button in Account Details of the iCloud preferences pane is for testing purposes and will not be available in the final release.
  • First-time iCloud setup may fail. Disabled services may be enabled manually in the iCloud preferences pane.
  • After upgrading to Developer Preview 3, iCloud Keychain will need to be reenabled in the iCloud preferences pane.
  • iCloud Keychain in OS X Mavericks Developer Seed 3 is not backward compatible with iOS 7 Seed 2 and OS X Mavericks Developer Seed 2.

Third-Party Applications

  • Installation within a virtual machine is not supported for VMWare Fusion.
  • Adobe After Effects CS6 will not function correctly.


  • Screen recordings taken with Developer Preview 3 are not compatible with earlier releases of OS X.
  • The QuickTime Player progress bar may be nonfunctional when opening media that requires conversion prior to playback.
  • Aperture may exit unexpectedly when exporting an image while in full screen.
  • Moving a full-screen Aperture window to a secondary display may prevent the app window from being visible in subsequent attempts to use full screen.
  • When saving from Photoshop, Save As may not respect the selected file type.
  • Fusion Drive volumes created with Developer Preview 3 are not compatible with OS X v10.8.4 or earlier.
  • Developer Preview 3 includes OpenSSH 6.2p2.

About the author

Buster HeinBuster Hein is a freelance writer and social media expert who lives in Phoenix, Arizona. Twitter: @bst3r.

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