Apple Releases OS X Mountain Lion Developer Preview 3

Just over a month after the arrival of the previous build, Apple today seeded registered members of the Mac Developer Program with the third developer preview version of OS X Mountain Lion.

mountain lion dev 3
The new version arrives as Build 12A178q, up from the earlier 12A154q version. Changes included in the new version have yet to be discovered, but those with access to the build will undoubtedly be searching for Apple's latest tweaks as the company continues to work on the next-generation operating system.

Apple does list a number of known issues with the current build:

- 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 also appears to be continuing to put a fair amount of effort into getting Game Center up and running on OS X with the new build.

OS X Mountain Lion is Apple's next major operating system version and is scheduled for release in "late summer". The release will offer greater integration with iCloud, as well as a number of new feature including some drawn from iOS.

Top Rated Comments

wikus Avatar
126 months ago
Mission Control needs refinement.

Please give us an option in system preferences to turn OFF grouping of windows when Mission Control is activated. A simple OPTION would satisfy so many people and would have ZERO effect on all those that negate this request.

If you have 3 windows open in Illustrator and another 3 open in Photoshop and you want to drag an object from illustrator to photoshop, you need to do the following;

1) Click and hold the desired object in Illustrator
2) Hit a hot corner to activate mission control (show all windows, grouped by app)
3) Hover and hold over the group of windows in Photoshop
4) Hit another hot corner to show all windows from within Photoshop
5) Hover and hold over desired open document in Photoshop
6) Let go of the object and it gets pasted in

STEPS 3 AND 4 RIGHT THERE ARE WHY MISSION CONTROL IS A FAILURE.

Expose allowed everyone to go DIRECTLY into the desired open document window of any specific application, bypassing steps three and four. Lion DID NOT make things easier, it made workflow SLOWER.
Score: 29 Votes (Like | Disagree)
Consultant Avatar
126 months ago
Mission Control needs refinement.

Please give us an option in system preferences to turn OFF grouping of windows when Mission Control is activated. A simple OPTION would satisfy so many people and would have ZERO effect on all those that negate this request.

Write to apple.com/feedback
Score: 26 Votes (Like | Disagree)
wikus Avatar
126 months ago
Nobody likes nazies. Unless they are zombies as well.

You spelled 'Nazis' wrong.
Score: 15 Votes (Like | Disagree)
wikus Avatar
126 months ago
Just to be more accurate, it would have a (negligible, but) non-zero effect on those who negate the request. After all, it would be an additional checkbox for eyes to scan over, it takes up physical pixels, etc.

If it were truly zero negative effect, then all software and operating system problems could be solved by adding more checkboxes in the settings. But who wants to use software that has really complicated settings pages?
A single checkbox in System Preferences isnt somehow going to make things any different. Here's how it looks like in OS X Lion currently;



Heres how it is in Snow Leopard;



Anyone that knows how to use System Preferences wont find the single extra checkmark any more confusing. The options in OS X change regularly anyway, but Apple has failed miserably to give multitaskers some proper options with Mission Control, that is to say, Expose was fantastic, seeing ALL my open windows ALL AT ONCE by hitting a hot corner gave me the ability to quickly go from Illustrator to Photoshop without hitting any keys or using a trackpad and, this is the big one; without releasing any objects i've selected in Illustrator. Direct drag and drop via Expose is now GONE.
Score: 13 Votes (Like | Disagree)
afin Avatar
126 months ago
I hope they take as much time as they need to smooth things out.
Score: 12 Votes (Like | Disagree)
PaulKemp Avatar
126 months ago
Sorry to be the Grammar Nazi, but it should be a "number of new features."

Nobody likes nazies. Unless they are zombies as well.
Score: 11 Votes (Like | Disagree)

Related Stories

Mac Notebook Upgrade Program

Apple Introduces New MacBook Upgrade Program for Business Partners

Monday November 29, 2021 7:38 am PST by
In association with CIT as the financing partner, Apple has launched a new Mac Upgrade Program for small businesses and Apple business partners that allow companies to easily distribute and upgrade their fleets of MacBooks at an affordable price to all of their workers. As outlined on CIT's website, shared by Max Weinbach, Apple Business Partners can distribute the 13-inch MacBook Pro,...
General cyber monday 20 sale feature

Best Cyber Monday Deals for AirPods, Apple Pencil, iMac, More

Monday November 29, 2021 4:19 am PST by
With Black Friday over, Cyber Monday 2021 is now in full swing and you can find many of the same sales as last week on Apple products like AirPods, Apple Pencil, and iPad Pro. In this article we're focusing on the best Cyber Monday discounts on Apple products like these and more. Note: MacRumors is an affiliate partner with some of these vendors. When you click a link and make a purchase, we...
2017 apple tv

Cyber Monday: Original Apple TV 4K Drops to $99.99 for Amazon Prime Members

Monday November 29, 2021 12:01 pm PST by
We've been tracking Apple product and accessory deals for Cyber Monday 2021 today, and now Woot is offering a solid discount on the previous generation 32GB Apple TV 4K. You can get this device in new condition for just $99.99 if you're an Amazon Prime member. Note that this sale will last for one day only. Note: MacRumors is an affiliate partner with some of these vendors. When you click a...
iphone holiday

Best Black Friday iPhone Deals Still Available

Friday November 26, 2021 4:58 am PST by
Cellular carriers have always offered big savings on the newest iPhone models during the holidays, and Black Friday 2021 sales have now carried over into Cyber Monday as well. Right now we're tracking notable offers on the iPhone 13 and iPhone 13 Pro devices from AT&T, Verizon, and T-Mobile. For even more savings, keep an eye on older models like iPhone SE. Note: MacRumors is an affiliate...
General cyber monday 20 sale feature 2

Best Cyber Monday Apple Accessory Deals Available Today

Monday November 29, 2021 6:41 am PST by
We started sharing deals on Apple products for Cyber Monday 2021 earlier today, and now we're tracking deals and bargains available from all of the best Apple accessory companies. Similar to Black Friday, you can expect Cyber Monday savings from Twelve South, Nomad, Belkin, Casetify, and many more. Note: MacRumors is an affiliate partner with some of these vendors. When you click a link and...
iPhone SE Cosmopolitan Clean

New iPhone SE Reportedly on Track for Release in First Quarter of 2022

Tuesday November 30, 2021 8:08 am PST by
Apple plans to release a third-generation iPhone SE in the first quarter of 2022, according to Taiwanese research firm TrendForce. If this timeframe proves to be accurate, we can expect the device to be released by the end of March. As previously rumored, TrendForce said the new iPhone SE will remain a mid-range smartphone with added support for 5G:In terms of product development, Apple is...