Hi everyone. I started this discussion a while back and just want to clarify the current status of this issue so you can save the time of reading all these posts: THE FACTS - The horizontal lines issue is random, yet persistent, in both playback and renders in both H.264 and Prores. - You can get clean renders using open CL, there's just no way of predicting when it will work. - The issue is persistent in both Premiere Pro and Adobe Media encoder. - Creating other user accounts, clearing the cache, or avoiding 3rd party plug ins will NOT fix the issue. - Calling tech support will not fix the issue. This discussion is your best source. THE WORKAROUND - To get around the playback/render issue in PP, go up to the project menu, and in the settings turn off open CL. Use software only. - To get around the render issue in AME, turn off open CL in the render panel. Use software only. THE MOST LIKELY FIX TO THIS ISSUE since not everyone is having this issue, the most likely fix is found in post #60 (J Schwarz). I have an appointment at the apple store this week to line up my replacement cards.
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