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macrumors bot
Original poster
Apr 12, 2001

Apple today released the third beta of OS X 10.11 El Capitan to developers for testing purposes, just over two weeks after releasing the second El Capitan beta and a month after unveiling the new operating system at its 2015 Worldwide Developers Conference.

The update is available through the software update mechanism in the Mac App Store and through the Apple Developer Center.


OS X El Capitan largely builds on the features introduced with OS X Yosemite, focusing on improving performance and user experience. Behind-the-scenes improvements in El Capitan have made a number of apps and processes on the Mac much faster, and the introduction of Metal makes system-level graphics rendering 40 percent more efficient.

Along with a new systemwide font, El Capitan includes a revamped Mission Control feature, a new Split View feature for using two full-screen apps at once, deeper functionality for Spotlight, and several new features for Safari, including Pinned Sites for housing frequently-visited websites and a universal mute button that quiets all tabs.

OS X 10.11 El Capitan is currently only available to registered developers, but Apple plans to offer a public beta of the software in July. Following testing, El Capitan will see a final release in the fall of 2015.

What's new in OS X El Capitan beta 3:

Two-Factor Authentication - iOS 9 and OS X 10.11 El Capitan include an entirely revamped two-factor authentication system.

Photos app - As in iOS 9 beta 3, there are new albums for selfies and screenshots in the Photos app in El Capitan beta 3.

Article Link: Apple Seeds Third OS X 10.11 El Capitan Beta to Developers


macrumors 68020
Jun 8, 2011
If beta 3 never happened and beta 2 became the public release, it would still be better than Yosemite. And that says a lot, because I never had problems with Yosemite.
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macrumors newbie
Apr 8, 2015
changelog anyone?

OS X El Capitan Beta 3 Release Notes

OS X El Capitan Developer Beta 3 is prerelease software. Do not use this prerelease software in a commercial operating environment or with important data. You should back up all of your data before installing this software and regularly back up data while using the software.

If an installation of OS X v10.11 Developer Beta 3 fails, try installing again, or install the OS X El Capitan Developer Beta 3 Recovery Update and use OS X Recovery. More information about OS X Recovery is available here:

Developer Beta System Requirements

The OS X El Capitan Developer Beta supports the following Macs:

iMac (Mid 2007 or newer) MacBook Air (Late 2008 or newer) MacBook (Late 2008 Aluminum, or Early 2009 or newer) Mac mini (Early 2009 or newer) MacBook Pro (Mid/Late 2007 or newer) Mac Pro (Early 2008 or newer) Xserve (Early 2009) Notes and Known Issues

Installation Note

After upgrading to OS X El Capitan Developer Beta, applications that write to protected/system locations may no longer function correctly.

Known Issues

Directly upgrading from OS X Lion or earlier to OS X El Capitan Developer Beta 3 is not recommended.

Selecting the ‘Do It Later’ option will not install updates for Standard user Accounts.

Some systems may fail to boot after installation if USB devices are attached. Remove USB devices before booting to resolve.

Some Apple ID accounts will be offered the option to upgrade to using two-factor authentication.

Known Issues

Attempting to enroll in two-factor authentication after installing OS X El Capitan Beta 3 may display an error regarding access to iCloud secure data. The iCloud Preference Pane can be used to complete enrollment. After enabling two-factor authentication users may be prompted to re-enable two-factor authentication again.

If you have two-factor authentication enabled, you may not be able to sign into services using OS X El Capitan or iOS 9 beta 2 or earlier. If you enable two-factor authentication, iTunes purchases on Mac and Windows will require you to append a 6-digit code to the end of your password on every purchase. The 6-digit code will automatically be sent to your iOS 9 or OS X El Capitan devices.

When there is only a single trusted device using two-factor authentication, you will need to generate a code in the iCloud Preference Pane when requested.

If you disable two-factor authentication and set a new password at, the password requirements are not indicated so your password may not be accepted. Please ensure your password meets the following requirements:

Have at least one lower case character * Have at least one capital letter * Have at least one number * Your password must not contain more than two consecutive identical characters * Not be the same as the account name * Be at least 8 characters * Not be a common password

You cannot manage your two-factor authentication trusted devices at Devices can be managed in the iCloud Preference Pane.

Known Issues

Location dropdown menus in the Places view may not work correctly.

Faces may not be detected in newly-imported photos.

Books, Cards and Calendars created in iPhoto may have missing content.

Known Issues

Time Machine cannot selectively restore deleted messages in Mail in OS X El Capitan Developer Beta 3.

Email received before installing OS X El Capitan Beta 1 will not work with the Proactive Assistant features.

Mail may exit unexpectedly when checking for new messages on an Exchange 2010 account.


Photos libraries are not backwards compatible. Once a library has been opened in the OS X El Capitan Developer Beta, it will no longer be openable in OS X Yosemite or earlier.

Known Issues

Upgrades of existing iPhoto / Aperture libraries to Photos libraries will not succeed in OS X El Capitan Beta 3. Upgrade your iPhoto / Aperture library to Photos on a pre-OS X El Capitan Beta 3 system or create a new Photos library and import the assets into this new library.

Photos app may prevent system sleep. Quit Photos before putting the system to sleep.

Addresses may not be visible in edit panel when ordering print products. Language Known Issues

Some text may not be localized to the selected system language. Some languages may have clipped or misaligned layout.


System file permissions are automatically protected, and updated during Software Updates. The Repair Permissions function is no longer necessary.

Known Issues

Aperture may crash when importing audio on certain configs. Some apps not downloaded from the App Store may take longer than expected to verify and prepare before launching.

Creation of a Boot Camp partition may fail.

The built-in and connected cameras may not work in some Apps. FileVault passwords may not be recoverable via iCloud.

Devices running iOS 9 Beta may not connect to iTunes on OS X El Capitan Developer Beta 3. To resolve install Xcode 7 beta or iTunes 12.2.

Wireless Migration may not work as expected in OS X El Capitan Beta 3. To work around, please migrate via a wired connection.

Some USB devices may not mount . AIM video chat and screen sharing in Messages are not available in this beta.

2012 and later systems may fail to associate to Wi-Fi after wake from sleep. Turn Wi-Fi off and on to resolve this issue.
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macrumors regular
Mar 16, 2013
Has anyone else with a 2014 13" rMB felt like system audio has been clearer and louder since El Cap Beta 1? I stopped using Boom 2.
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