OS X Mavericks Beta 3: Features & Install Guide
OS X Mavericks beta 3 (build 13A476u) was released to developers on July 8, 2013, as the third preview of Apple’s then-upcoming desktop operating system. This guide covers the key features introduced or refined in that specific beta, and provides a step-by-step installation walkthrough for developers who had access to it. It also explains the differences from earlier betas, common installation issues, and how the beta preview process worked.
Background: The Mavericks Beta Program
Apple announced OS X 10.9 Mavericks at WWDC in June 2013, marking a shift to a free upgrade model and a new naming scheme based on California locations. The beta program was open to registered developers, who received access through the Mac Dev Center. Beta 1 (build 13A476u) was released at WWDC, followed by Beta 2 (build 13A510d) on June 24, and Beta 3 on July 8. Each beta was intended to refine features, improve performance, and fix bugs reported by developers.
Key Features in Beta 3
Beta 3 focused on stability and performance improvements over earlier builds, but it also introduced several user-visible changes:
- Improved multi-display support: Each display could now show its own menu bar and Dock, a major change from earlier versions where the menu bar only appeared on the primary display. Beta 3 refined the behavior of full-screen apps on secondary displays.
- Enhanced power management: The new “App Napâ€� and “Timer Coalescingâ€� features were tuned in Beta 3 to further reduce energy consumption. Developers could see the effects in Activity Monitor’s new “Energyâ€� tab.
- Finder enhancements: The Finder received a new “Tags� system (though it was still in early stages), and the “Open With� menu was improved. Beta 3 fixed several issues where tags would not sync properly.
- iBooks and Maps apps: These new OS X apps were updated with bug fixes and performance improvements. iBooks gained better PDF rendering, and Maps received improved keyboard navigation.
- Safari 7: The new browser included “Shared Links� and a redesigned sidebar. Beta 3 addressed some memory leaks and improved JavaScript performance.
How to Install Beta 3
Installing a beta requires an Apple Developer account (paid at the time). Here are the steps:
- Back up your Mac: Use Time Machine or another backup method to create a full backup before installing any beta.
- Download the installer: Log in to the Mac Dev Center, go to the “OS X Mavericks� section, and download the “OS X Mavericks Developer Preview 3� installer (a .app file).
- Run the installer: Double-click the downloaded .app file. It will open a window with a “Continue� button. Follow the on-screen instructions.
- Choose a startup disk: Select the disk where you want to install (usually your main disk). The installer will restart your Mac and begin the installation.
- Wait for completion: The installation can take 30–60 minutes. Your Mac will restart several times.
If you were already running Beta 1 or Beta 2, you could install Beta 3 directly over them, as it was a delta update. However, a clean install was recommended for testing purposes.
Common Installation Problems
Developers reported a few recurring issues with Beta 3 installations:
- Insufficient storage: The installer requires about 8 GB of free space. If you have less, the installation fails with a “Not enough space� message.
- Stuck at “Estimating time�: This was often caused by network issues if the installer was trying to fetch additional components. Try disconnecting from the internet and retrying.
- Kernel panics after first boot: Some users experienced kernel panics on Macs with third-party RAM or SSDs. Resetting NVRAM (restart and hold Command+Option+P+R) often helped.
- iCloud sign-in failure: After installation, some users couldn’t sign into iCloud. This was usually a temporary server issue; waiting and retrying resolved it.
Comparing Beta 3 to Later Releases
Beta 3 was not the final version. Apple released Beta 4 (build 13A524d) on July 22, and the Golden Master (GM) in September 2013. The GM and final release (build 13A603) included several changes that Beta 3 lacked:
- iCloud Keychain: Not fully functional until later betas.
- Improved graphics performance: OpenGL optimizations were refined after Beta 3.
- Better battery life: Further tuning of App Nap and Timer Coalescing.
For most users, Beta 3 was not recommended for daily use, as it was a developer preview with known bugs.
Costs and Eligibility
At the time, a Mac Developer Program membership cost $99 per year. This was required to download the beta. However, Apple later made the final version of OS X Mavericks free for all users, a historic change from previous paid upgrades. If you wanted to try the beta without a developer account, you could not legally obtain it; Apple did not offer a public beta program for Mavericks.
Safety and Precautions
Betas are by definition unfinished. Before installing, consider:
- Use a separate partition or external drive: This prevents data loss if the beta corrupts your main system.
- Do not install on your primary work machine: Betas can crash, and some apps may not work.
- Report bugs: Developers were encouraged to use the Bug Reporter tool to submit issues.
Frequently Asked Questions
Q: Can I install OS X Mavericks Beta 3 on any Mac?
A: No. Apple specified a list of supported Macs, including iMac (mid-2007 or later), MacBook (late 2008 or later), MacBook Pro (mid-2007 or later), MacBook Air (late 2008 or later), Mac mini (early 2009 or later), and Mac Pro (early 2008 or later).
Q: Will my existing apps work on Beta 3?
A: Most apps that worked on Mountain Lion should work, but some older 32-bit apps may have issues. Also, apps that rely on kernel extensions might need updates.
Q: How do I revert to Mountain Lion after installing Beta 3?
A: If you backed up with Time Machine, you can restore from the backup. Alternatively, you can use the Recovery HD to reinstall Mountain Lion, but you’ll need your original install media or a bootable USB drive.
Q: Is Beta 3 stable enough for daily use?
A: It was a developer preview, so not recommended for daily use. Many users reported random crashes and Wi-Fi issues. The final release was much more stable.
Q: Did Beta 3 include the new “iWork for iCloud� beta?
A: No, iWork for iCloud was a separate beta available through iCloud.com, not part of the OS X beta.
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