Apple seeds OS X Mavericks Developer Preview 3

To go along with Apple’s release of iOS 7 beta 3 earlier today, Apple has also released the third developer preview of its desktop operating system, OS X Mavericks. The update, which comes in at just a hair over a gig, touches down two weeks after the second developer preview.

I’ve already installed DP3 on my test partition, and I haven’t noticed any drastic changes thus far in my usage with it. Check out the release notes inside…


  • 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.

If you’re an Apple developer, then you may head over to the developer portal to download OS X Mavericks Developer Preview 3. If you’re already running any of the previous Mavericks Developer Previews, then you can use the update found via the App Store app instead.