Release Notes:
Notes and Known Issues 
Installation 
⁃	Network migration from earlier versions of OS X requires the Migration Update for Snow Leopard, Lion, or Mountain Lion. 
⁃	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 
⁃	When enabling iCloud Keychain, a blank sheet may appear. Force Quit System Preferences and retry. 
⁃	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 manually enabled in the iCloud preferences pane. 
⁃	After upgrading to Developer Preview 3, iCloud Keychain will need to be re-enabled 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 and Devices 
⁃	Installation within a virtual machine is not supported for VMWare Fusion. 
⁃	Adobe After Effects CS6 will not function correctly. 
Other 
⁃	Maps may display some graphical corruption when resizing windows or switching from standard to satellite view. 
⁃	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 selected filetype. 
⁃	Fusion Drive volumes created with Developer Preview 3 are not compatible with OS X version 10.8.4 or earlier. 
⁃	Developer Preview 3 includes OpenSSH 6.2p2.