Apple Releases OS X Mountain Lion Developer Preview 3

OS X Mountain Lion

Apple has released the third developer preview of their next generation Mac OS X (10.8) dubbed OS X Mountain Lion to developers of Mac Dev Program.

OS X Mountain Lion will include a number of popular apps and features such as Messages, Notes, Reminders, Game Center, Notification Center, Share Sheets, Twitter integration and AirPlay Mirroring from iPad.

Apple hasn’t provided any details about the new features and fixes introduced in the new version (build – 12A178q), but has listed the following known issues in the seed note:

  • On systems with FileVault enabled, canceling the restart to the Mountain Lion Developer Preview 3 Installer may leave your system unable to present a password dialog at boot time. You can repair the problem by holding down command-R to boot to the Recovery OS and then using Disk Utility to unlock and Repair your volume. 
  • Installing OS X 10.8 over 10.7.2 or earlier with FileVault turned on may fail 
  • Pre-Lion FileVault user accounts are not supported in this Developer Preview 
  • Some Apple menu items such as Restart may not work when a sandboxed app is in the foreground 
  • iTunes no longer syncs Notes 
  • Mail’s photo browser cannot access the iPhoto library 
  • Back to My Mac doesn’t work for the first 5 minutes after rebooting 
  • DVD Player may not launch after inserting a DVD on some systems 
  • Most help topics are unavailable in this Developer Preview 
  • In the Recovery HD: 
    •      Some icons may be missing 
    •      Network Utility’s Lookup pane does not work 
    •      Time Machine restoration via a AFP share does not work 
    •      Restoring from a Time Machine backup via AFP does not work 
  • Migration from a Time Machine backup that excludes paths such as /System may yield an unusable system 
  • Brightness settings may change unexpectedly after reboot 
  • Display brightness may be dim after sleep or reboot 
  • If Mail is hidden at logout time, it may not be correctly relaunched during a subsequent login but will appear to be running 
  • Java applets may not work in Safari 
  • QuickTime screen recordings may produce corrupted videos or cause an exception when run on machines with NVDIA graphics

Apple had released the first developer preview of OS X Mountain Lion back in February and plans to  to release it to users in late summer 2012.

You can check out this post to get a sneak peek of the new features that will be coming to your Mac later this summer.