Computer: 2009 MacPro 2.66GHz quad | 12GB RAM | OSX 10.9.5 Yesterday Quicktime X started having audio playback problems, regardless of source. Whether it's a video, mp3, or audio from the Safari, the same distortion occurs. To my ears it sounds sort of like a buffering problem, but it could be anything, really. The only thing Ithat has changed is that I updated the drivers of my external audio interface (Avid MboxPro 3), but it works fine with iTunes, Firefox, and other applications, which is what ledme to believe Quicktime is the problem. Anybody have this problem, or knows how to fix? Thanks.