Apple has seeded a new version of the upcoming Mac OS X 10.6.5 release. The last Mac OS X 10.6.5 build was released two weeks prior. According to MacRumors the new build affects 3D graphics, iCal, Mail, QuickTime, Time Machine and USB Devices.
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It is still completely unclear when Apple will release OS X 10.6.5 to the public. The last major update for Mac computers happend in June.