Apple Seeds New Beta of OS X Mountain Lion 10.8.1 to Developers - MacRumors
Skip to Content

Apple Seeds New Beta of OS X Mountain Lion 10.8.1 to Developers

by

Apple has seeded a new beta of OS X 10.8.1 to developers, exactly a week after the first build came out, according to 9to5Mac.

The release has a build number of 12B17 and Apple reports no known issues, but asks developers to focus on a wide variety of areas for their testing. The delta update -- where only items that have changed are downloaded -- weighs in at 43.27MB.

Mountainlionbeta
According to 9to5Mac, developers have been asked to test Active Directory, Microsoft Exchange in Mail, PAC proxies in Safari, SMB, USB, and Wi-Fi and audio when connected to the Apple Thunderbolt display -- the same list of items as the prior release.

The OS X 10.8.1 seed is available for download via the OS X Developer portal at developer.apple.com.

Top Rated Comments

178 months ago
No, I haven't installed it - but I have been following the various reports of hard crashes, absurdly short battery life and iOS-like oddities. And it doesn't seem that great to me.

So whining about something you've never even tried. Thanks, that's useful.

There are always problems with any release of any software, OS or otherwise, so anyone could declare any release a "train wreck" if the only basis for that is some people reporting problems online.

What really matters is how widespread problems are and how severe they are. Problems are to be expected for any .0 release, and for a .0 release it's surprisingly solid (heck of a lot better than 10.7.0, and I suspect better than 10.7.4 for most people).

It's just common knowledge, anyone doing mission critical work or otherwise sensitive to issues should skip all .0 releases (and often one or two after that). And those that do need not regale us with whining about problems they've just heard about, that adds nothing to the discussion.
Score: 9 Votes (Like | Disagree)
178 months ago
Possible release next week since there are no known issues.

All things considered Mountain Lion has been pretty much problem free for a 10.x.0 release.

Then please, read every post in this thread:

https://discussions.apple.com/thread/4135250?start=0&tstart=0

and then report back :P
Score: 8 Votes (Like | Disagree)
Cynicalone Avatar
178 months ago
Possible release next week since there are no known issues.

All things considered Mountain Lion has been pretty much problem free for a 10.x.0 release.
Score: 7 Votes (Like | Disagree)
mw360 Avatar
178 months ago
So, still no fix for the "weighs in at" issue. :rolleyes:
Score: 6 Votes (Like | Disagree)
Kariya Avatar
178 months ago
Install the OS and see for yourself if it really is that terrible instead of complaining for the sake of complaining.

As it stands you're just whining and whining...and its quite annoying to read in every other thread one comes across.
Score: 4 Votes (Like | Disagree)
178 months ago
And people CONTINUE to spout the same nonsense about the purported advantages of a "clean install" - for every five positive reports, I can show you five OTHER reports in these forums from users who have the same if not worse problems AFTER a clean install.

So let's stop with this placebo recipe, shall we?[COLOR="#808080"]

I did a clean install. It worked for ME, perhaps it will not work for YOU or OTHER people but it worked for ME. A clean install of a new OS is never a bad thing to get rid of left over files here and there.

It's not the end all be all solution to anything, but it can be beneficial. I know you do not think so but so far as I can tell you don't like much of anything.
Score: 4 Votes (Like | Disagree)

Popular Stories

Apple Event Logo

Apple to Launch These 15+ New Products Later This Year

Friday March 27, 2026 2:03 pm PDT by
March has been an incredibly busy month for Apple, with the company unveiling more than 10 new products and accessories. We said hello to the MacBook Neo at the start of the month, and we bid farewell to the Mac Pro at the end of it. Nevertheless, there is still a lot more to come this year. Beyond the usual annual updates to iPhones and Apple Watches, Apple's all-new smart home hub is...
iOS 26

iOS 26.4 Adds Two New Features to CarPlay

Tuesday March 24, 2026 1:55 pm PDT by
iOS 26.4 was released today, and it includes a couple of new features for CarPlay: an Ambient Music widget and support for voice-based chatbot apps. To update your iPhone 11 or newer to iOS 26.4, open the Settings app and tap on General → Software Update. CarPlay will automatically offer the new features so long as the iPhone connected to your vehicle is running iOS 26.4 or later....
Mac Pro Feature Teal

Apple Confirms Mac Pro Is Dead, No Future Models Planned

Thursday March 26, 2026 2:04 pm PDT by
Apple has discontinued the Mac Pro and has removed the machine from its website, reports 9to5Mac. Apple said it does not plan to design a new version of the Mac Pro, and no new model will be coming in the future. The Mac Pro was last updated in 2023, which was when Apple added an M2 Ultra Apple silicon chip, but the chassis has not been refreshed since 2019. Apple redesigned the Mac Pro to...