Yosemite DP7 build 14A343f Beta 7

OS X Yosemite Seed Note

Introduction

OS X Yosemite Developer Preview 7 is pre-release software. Do not use this pre-release 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.

Please be aware that you will not be able to revert back to your previous system after updating. Please install this update on a system you are prepared to erase if necessary.

If an installation of OS X Yosemite Developer Preview 7 fails, try using Disk Utility from a Recovery HD to repair the disk.

Developer Preview System Requirements

The OS X Yosemite Developer Preview 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 Known Issue
- Users with automatic installation of updates enabled will not be automatically logged in after reboot from installing Developer Preview 7. If FileVault is enabled, the system will shut down if the user does not log in shortly after reboot.

Family Sharing Known Issues
- Shared purchase history pages on Mac App Store and iOS App Store are disabled.
- Items already owned by family members must be re-downloaded from the Purchased page (not Store pages) to get them free of additional charge.

Gatekeeper Note
- Signatures created with OS X v10.8.5 or earlier (“v1 signatures”) are obsoleted and will no longer be recognized by Gatekeeper. To ensure your apps will run on updated versions of OS X they must be signed using the codesign tool on OS X v10.9 or later (“v2 signatures”). For more information, see OS X Code Signing In Depth.

Handoff Known Issues
- Using Handoff to pass an untitled TextEdit document between two Macs may not work. Saving the document first and waiting 5-10 seconds before attempting Handoff may resolve this issue.

iCloud Drive Note
- Migrating to iCloud Drive will disable Documents & Data syncing for your iCloud account on OS X Mavericks and earlier Macs, as well as iOS 7 and earlier devices.

Aperture Note
- Only Aperture 3.5.1 will run on OS X Yosemite Developer Preview 7. Older versions of Aperture will not launch.

Aperture Known Issues
- Text and other UI elements such as checkboxes and radio buttons may be clipped or not display properly.
- Importing and exporting images, adjustments, and book PDF generation may be slower.
- Thumbnails and images may occasionally be out of sync when in Split Browser mode.
- Printing a book to Preview from the local printing dialog may result in an error.
- Adjustment and zoom sliders may not respond to single clicks and need to be dragged to operate.
- Leica Monochrom RAW images are not supported.
- The Auto-stack slider may be slow to respond.

iPhoto Note
- Only iPhoto 9.5.1 will run on OS X Yosemite Developer Preview 7. Older versions of iPhoto will not launch.

iPhoto Known Issues
- Text and other UI elements such as checkboxes and radio buttons may be clipped or not display properly.
- Images shared to Twitter and Messages may be rendered at a reduced size.
- Application window may not be restored to its original size after exiting Full Screen view.
- iPhoto may quit unexpectedly when entering Full Screen mode.

Safari Notes
- Subpixel rendering is now on by default for all web content. Websites or in-app web views with extremely tight design constraints may render differently.
- In OS X Yosemite Developer Preview 7, CSS object model getters Element.client{Left,Top,Width,Height} and Element.offset{Left,Top,Width,Height} will return rounded double values based on subpixel layout and rendering metrics instead of fractional values. Element.scroll{Left,Top,Width,Height} will return integral values.

Safari Known Issues
- Safari may stop responding while loading video when playing Netflix content.
- On certain machines, some forms of protected content, such as Netflix, may fail to play back. To resolve, hold down Option during the next reboot and select your OS X Yosemite partition.

Tools Notes
- In Developer Preview 7, unsigned or improperly signed kexts will not be loaded. To use unsigned kexts during development, this strict check can be disabled by adding a “kext-dev-mode=1” boot arg.
- AVFoundation changes the way some ID3 metadata values are represented as AVMetadataItems for binaries that are linked with the Developer Preview 7 SDK.
- Installing kernel extensions on systems running Developer Preview 7 may make your system un-bootable. To fix the issue, boot into the Recovery Partition and run the following:
⁃ touch /Volumes//System/Library/Extensions
⁃ kextcache -u /Volumes/
- In OS X Yosemite Developer Preview 7 and iOS 8.0 beta 5, the NSURLSessionTask class provides a new priority property. Complete usage details are available in the NSURLSession.h header file, provided by the Foundation framework.
- URLForUbiquityContainerIdentifier: might return nil when running your application in Xcode. If so, open System Preferences, navigate to iCloud > iCloud Drive, and enable Xcode.
- Developer Preview 7 includes new APIs to create CIContext objects that use the second GPU on Mac Pro hardware.
- App extensions for OS X are always run as 64-bit code. You will need to build your extensions, and any shared frameworks they depend upon, to include 64-bit support.

Tools Known Issues
- Some python modules may fail to install.

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