Ahh...the lines...we had them since day one...turn GPU on ...get em - turn Software Render on - machine is slow but no lines. Thanks to everyone in here- for all the update ideas, all the permission ideas, etc., all which we tired none of which worked. However what DID work - was one of two things - both of which Apple had to do - 1. they replaced both graphics boards. 2. they re seated the RAM which they said was not seated perfectly. It took two months and many good people at Apple and patience on our part but - there a problem, and if you have lines that get burned in -withGPU rendering on - you have it. It is my belief that something Adobe is calling in the GPU api is not correct ( or not expected) - but also that Apple changed something in the GPU architecture to fix some4thing, and it worked. So ...2 months and 5 days later we have no lines.
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