OS X Yosemite Developer Preview 8 Release Notes
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”).
Handoff Known Issue
– 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.
SMS Note
– SMS Continuity is not currently available for testing. It will be available in October via a free update to iOS 8.
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 8. 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.
– 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.
iPhoto Note
– Only iPhoto 9.5.1 will run on OS X Yosemite Developer Preview 8. 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.
Safari Known Issues
– 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 8, 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 8 SDK.
– Installing kernel extensions on systems running Developer Preview 8 may make your system un-bootable. To fix the issue, boot into the Recovery Partition and run the following:
⁃ touch /Volumes/<10.10 Partition>/System/Library/Extensions
⁃ kextcache -u /Volumes/<10.10 Partition>
– In OS X Yosemite Developer Preview 8 and iOS 8.0 beta, 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 8 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.
Other Known Issues
– Some text may not be localized to the selected system language.
– Some languages may have clipped or misaligned layout.
– Locking your system via Find My Mac may may result in the OS X Yosemite Partition being unusable. Rebooting into another partition will allow the system to be unlocked.
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