Softwareupdate
Apple today seeded build 12D58 of OS X Mountain Lion 10.8.3 to developers, marking the seventh beta iteration of the newest version of Mountain Lion. 10.8.3 was first seeded to developers in November.

Build 12D58 comes a week after build 12D54, and like the previous build, contains no known issues or features. Build 12D54 brought significant changes to WiFi, and asked developers to focus on testing AirPlay, AirPort, Game Center, Graphics Drivers, and Safari.

9to5Mac notes that the new build again contains significant changes to WiFi, but additional changes are unknown. Registered developers can download the update on Apple’s Developer Page.

This post originally referred to Build 12D58 as the eighth developer seed of OS X 10.8.3 when it was actually the seventh seed.

Top Rated Comments

iBug2 Avatar
165 months ago
I don't get all these beta's? Are Apple actually listening and at least TRYING to fix the damn slow shutdown bug and options having to be launched twice from settings such as desktop background?

The slow shutdown is not really a "bug". It's an inconvenience for some people who have it. Apple has a lot more serious issues to fix during these beta tests. Something like a slow shutdown would be on the bottom of their list.
Score: 10 Votes (Like | Disagree)
daneoni Avatar
165 months ago
Agreed, but a a simple and easy to fix bug like this not being fixed for a quarter of a year is starting to produce a painful impression.

Mac sales going down should be a warning - do your homework Apple!
Mac sales going down is due to a general decline in PC sales. Thanks to the post-PC era. Not because of some random, minor, bug in an OS.
Score: 9 Votes (Like | Disagree)
tywebb13 Avatar
165 months ago
The installer includes a feature list:

The 10.8.3 update is recommended for all OS X Mountain Lion users and includes features and fixes that improve the stability, compatibility, and security of your Mac, including the following:
• The ability to redeem iTunes gift cards in the Mac App Store using your Mac's built-in camera
• Boot Camp support for installing Windows 8
• Boot Camp support for Macs with a 3TB hard drive
• A fix for an issue that may cause Logic Pro to become unresponsive when using certain plug-ins
• A fix for an issue that may cause audio to stutter on 2011 iMacs
• Includes Safari 6.0.3
Score: 8 Votes (Like | Disagree)
LlamaLarry Avatar
165 months ago
I am always a surprised to see people complaining about slow shutdown (and I assume reboots). I guess I just don't shutdown/reboot as often as some folks; must be a Windows convert thing as I am pretty sure older Mac (and other *nix) don't shutdown OR reboot just for fun or often enough to care how long it takes.

It wasn't that long ago that I remember people complaining that rebooting to upgrade Safari or other system updates was literally like the end of the world because some folks had so much stuff open for their workflows they could not handle having to launch them all manually... Now OSX offers you the choice to have it do that for you as well.
Score: 5 Votes (Like | Disagree)
The Bulge Avatar
165 months ago
The slow shutdown is not really a "bug". It's an inconvenience for some people who have it. Apple has a lot more serious issues to fix during these beta tests. Something like a slow shutdown would be on the bottom of their list.

It must be fixed and as a user i don't really care how or do you want the next generation Macs with OS X to shut down in 30 seconds out of the box because it's low priority?
Score: 4 Votes (Like | Disagree)
iBug2 Avatar
165 months ago
Agreed, but a a simple and easy to fix bug like this not being fixed for a quarter of a year is starting to produce a painful impression.

Mac sales going down should be a warning - do your homework Apple!

Why do you assume it's an easy fix? Maybe it isn't.
Score: 4 Votes (Like | Disagree)

Popular Stories

iOS 26 on iPhone Feature

Here's When iOS 26 Rolls Out Today in Every Time Zone [Update: Out Now!]

Monday September 15, 2025 12:00 am PDT by
Update 10:06 a.m.: iOS 26 is rolling out now, though it may take a bit for all users to see it, so keep checking! Today's the day! Apple is about to release iOS 26, which will deliver the biggest redesign since iOS 7 and bring a range of new features and improvements to iPhones worldwide. It's Apple's biggest software update of the year, and Apple announced at last week's iPhone event that...
iOS 26 Battery Glass Feature

Apple Says Installing iOS 26 Might Impact Battery Life

Monday September 15, 2025 10:56 am PDT by
In the iOS 26 release notes, Apple is warning iPhone users that installing the new software might have a temporary impact on battery life, which is normal. A new support document explains that major iOS updates require background setup like indexing data and files for search, downloading new assets, and updating apps. Further, Apple says that new features could require more resources,...
Tim Cook Rainbow

Apple Reportedly Plans to Launch These 10 Products in 'Coming Months'

Sunday September 14, 2025 8:45 am PDT by
Apple's annual September event is now in the rearview mirror, with the iPhone 17, iPhone 17 Pro, iPhone 17 Pro Max, iPhone Air, Apple Watch Series 11, Apple Watch Ultra 3, Apple Watch SE 3, and AirPods Pro 3 set to launch this Friday, September 19. As always, there is more to come. In his Power On newsletter today, Bloomberg's Mark Gurman said Apple plans to release many products in the...
AirPods Pro Firmware Feature

AirPods Pro 2 and AirPods 4 Get iOS 26 Features With New Firmware Update

Monday September 15, 2025 10:50 am PDT by
Apple today released updated firmware for the AirPods Pro 2 and the AirPods 4, introducing support for the new AirPods features that are included in iOS 26, iPadOS 26, and macOS Tahoe. The firmware has a build number of 8A356, and it replaces the current 7E93 firmware. With Apple's new software updates, the AirPods Pro 2 and the AirPods 4 support better audio quality for phone calls and...
iphone 17 lineup

iPhone 17 Models Launch on September 19 With These New Features

Friday September 12, 2025 7:58 am PDT by
Apple will launch its new iPhone 17 lineup and ultra-thin iPhone Air in stores on Friday, September 19, and the company has already shown off the new devices at its fall event, which ran with the the tagline "Awe dropping." The iPhone 17 series brings a host of new features and enhancements. Here's a rundown of the biggest upgrades and changes: iPhone 17 Display Changes The iPhone...
iOS 26 Feature

iOS 26 Available Now With These 8 New Features

Monday September 15, 2025 5:45 am PDT by
Following three months of beta testing, iOS 26 was released today, September 15. The update is compatible with the iPhone 11 series and newer, and it is available to install via the Settings app, under General → Software Update. Below, we have highlighted eight new features included in iOS 26. Even more new features and changes are outlined in Apple's release notes for the update. Some of ...
iPhone 17 Pro Air Boxes

iPhone Air and iPhone 17 Pro Boxes Revealed

Sunday September 14, 2025 1:36 pm PDT by
T-Mobile President Jon Freier today shared real-world photos of Apple's boxes for the iPhone Air, iPhone 17 Pro, and iPhone 17 models, which launch on Friday. Image Credit: Jon Freier Apple has typically included iPhone box renders in its product environmental reports, but it did not do so for the latest models. However, Apple's iPhone Upgrade Program page does offer some images of the boxes, ...