OS X Yosemite Developer Preview 6 release notes

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Apple has just seeded the Mac OS X Yosemite Developer Preview 6 release notes and also an updated download under build 14A329f, although iOS 8 beta 6 seems to be either delayed or not going live today, which is unusual considering it normally releases at the same time as desktop software.

We’ve included below some of the key points for OS X Yosemite preview 6 from the release notes that went live today, and those that are related to the new download. Developers can find the latest beta within the control panel now, and this will be one of the last before a public release in the coming weeks.

Handoff Known Issues – After installing Developer Preview 6, Handoff icons may not not show up on other Macs signed into the same iCloud account. Rebooting the machines may resolve this issue. Using Handoff to pass an untitled TextEdit document between two may not work. Saving the document first and waiting 5-10 seconds before attempting Handoff my resolve this issue.

Aperture Note – Only Aperture 3.5.1 will run on OS X Yosemite Developer Preview 6. Older versions of Aperture will not launch.

iPhoto Note – Only iPhoto 9.5.1 will run on OS X Yosemite Developer Preview 6. Older versions of iPhoto will not launch.

Phone Calls Known Issue – Notifications for phone calls may sometimes contain clipped text.

Safari Notes – In OS X Yosemite Developer Preview 6, 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.

Tools Notes – In Developer Preview 6, 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 6 SDK.

Installing kernel extensions on systems running Developer Preview 6 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 6 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. Developer Preview 6 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.

These are the main changes with OS X Yosemite Developer Preview 6 from the latest release notes. If you notice anything else that’s changed in the latest Yosemite preview build, then feel free to leave a comment below.

Also See: OS X 10.10.2 release to fix isolated router problems?

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