UPDATE FROM THE GUY WHO STARTED THIS WHOLE THREAD - See entry #426 for Apple's latest attempt at fixing my issue. A good effort, but alas, no fix. Apple is replacing my Mac Pro's logic board and ram on the 20th of this month. If the problem still manifests, they're going to give me a new computer. I'm able to use my Mac Pro to edit fast, which is awesome, but cannot render previews in the Premiere timeline, export video from Premiere, or export video via AME without my graphics cards turned off to avoid the random horizontal lines. For those of you who are still trying to get answers from Adobe, STOP. Don't waste your time on this forum or any other. Your problem is not software-based. I've had the same mac pro with the same issues since they first shipped earlier this year. I've done every conceivable upgrade, Apple has wiped my HD clean, my graphics cards have been replaced, and now this step. I can almost guarantee you will find no fix to this issue short of major hardware replacement. There is something in the bowels of my system that refuses to cooperate with my Premiere/AME software and it's looking to come down to a total replacement. So stop typing, stop searching, and start talking to your Apple store team about a real fix. You'll have to dive through a ton of hoops to get there (they won't replace your unit without being certain a few new parts can't fix it... which worked for me for about a week), but thats the only route I'm sure of at this point.
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