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Create Digital Music » OS X 10.4.9 Breaks Some Audio Unit Plug-ins?

I’ve been hearing a number of reports that the Mac OS X 10.4.9 update causes significant issues with some Audio Unit plug-ins, including those from popular developers Audio Damage and Ohmforce. (See Analog Industries blog for a comment thread and reports on Audio Damage; there’s also discussion on the Core Audio developer list which I hope will yield some revelations. Update: Note that Audio Damage is having only development issues; their plug-ins will work just fine if you’re a user.) This update apparently installs yet another version of the AU validator, which could be one clue. Apple has also made significant changes to QuickTime in recent releases, which can also cause issues with audio software in some cases.