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Huge HDMI issues in this beta: Can't output 4K to my TV anymore; sound cutting out in 1080p; flashing image (TV keeps switching between 1080p and 1081p‽). All things that were working perfectly in the first two betas.

Basically almost impossible to use with any reliability.

EDIT: It seems to be related to Thunderbolt power management? Everything seems to work as normal when only the HDMI converter is connected, but if my FW 800 - TB converted hard drive is also connected sounds starts cutting out again. This wasn't a problem previously, so something must have changed in this or previous beta.
 
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I thought these audio changes were only for iOS 9 to support the new audio plugins framework? If it is for OS X, then I stand corrected but again, nothing that would explain MS issues.

Along with adding AU support for iOS, there are also substantial changes to AU on OS X. New APIs and functionality changes, Apple says it should be compatible with older versions but obviously that's not the case and plugin devs have had to update.
 
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