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Apple today seeded build 13E25 of OS X 10.9.4 to developers



From MacRumors:
The beta is available through the Software Update mechanism in the Mac App Store and through the Mac Dev Center. It remains unclear what improvements the 10.9.4 update will bring to Mavericks, but it is likely to include bug fixes and stability enhancements. Apple is asking developers to focus on Graphics Drivers, Bluetooth, Audio Drivers, Finder, App Store, and Safari.
  Apple Seeds OS X Mavericks 10.9.4 Build 13E25 to Developers