OS X Mountain Lion Developer Preview 3 Seeded to Developers

Apple this afternoon seeded a new developer preview of their upcoming OS X Mountain Lion release to developers. This new build is at version 12A178q (previously 12A154q) and there aren’t any major changes that anyone has noticed just yet. However, Apple has included a large list of known issues in this build, which may include most, but not all, of what you can experience after installing it.

OS X Mountain Lion is scheduled for release sometime this summer, according to Apple. Mac refreshes have been rumored to come with it, but there’s no official word on that just yet. In fact, some have claimed that Apple will release a new MacBook Air later this month.

To acquire OS X Mountain Lion Developer Preview 3, you must be a registered Apple developer. If you are, then head to the Apple Developer Member Center and grab this new build while it’s still hot. Let us know if you find any major — or even minor — changes!

For now, here’s the list of known issues that you should keep in mind when testing things out:

- 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

[MacRumors]

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