Hard to explain this one, its an intermittent problem. Basically, exporting to the YouTube HD preset and sending to AME from Premiere. I play back the export and my music, for instance, is missing! The weird thing is, my dialogue is there, and I have some random audio clips on the same track (A1) in Premiere. Those clips are missing. Any clue whats going on here?! Could it be an audio conform issue or something in Premiere? Everything plays and sound perfect in edit, just missing in the exports. Very frustrating. Having this issue on several MacPro workstations. And there are no track or clip audio settings that are causing this that I can see.