Please add my name to the constantly growing numbers of people having major issues with Premiere Pro. I have an iMac late 2012 with 32GB Ram, i7Processor, SSD Hard Drive and Connected External GTech Thunderbolt 2 Discs. I use my Computer's hard drive which is the fastest of my discs to cache to and have not installed anything else than the Adobe CC Apps I work with. PP, AE, LR, Ps, Sg & Br I did this after the iMac which we thought Apple and I was the cause of my problems and it came back from the second time in service (this time Apple kept it for almost a month trying everything they could throw at it and found nothing wrong with the computer. Nonetheless in both occasions the changed the MOtherBoard and Graphics card which is an Nvidia GeForce GTX 680MX. The first time they even changed the Full screen as I was getting ghosting and flickers and pixels appearing on screen when working in Premiere Pro, so Apple assumed it may have been my screen. I am running OSX Yosemite 10.10.1 and Adobe CC 2014 apps.
So here we are 6 months after this started and I still am having the same issues as reported by others in previous post above! In addition I also have another issue which I tried fixing using suggestions in other posts about the problem to no avail. When I send a render/encode order from Premiere Pro to render in AME all works well, the project loads and when I am ready I do the render thru AME and it works (except when it crashes as reported above...;-)))) But if I send a render from AE to AME it won't accept it. AME opens and it just satys there waiting for the project to load and it never loads. I even tried doing it manually by opening AME and placing the AE project in AME manually but the projet will not load.
Ok well, I hope you gus at Adobe took some rest during the holidays because you have yourselves a load of work to fix this in 2015.
Jose
P.S: Oh and for the record, I just remembered this detail because it just happened...again. When I've had it with crashes rendering, like this yesterday and morning trying to render a project to which I made some changes and nothing works. I disconnect my external hard drives on which I have all the data and connect them to my MacBook Pro late 2012 which only has 16GB of ram and a much slower processor running on the same OSX Yosemite and it just renders the darn thing, never complains, never crashes. The issues are clearly between Premiere Pro and new machines with fast cards such as mine using Cuda etc etc. The only problem with this backup arrangement is it takes three hours to render a 4 minute film in 4K. Makes me think that when this render is done I will try and render it on my iMac not using Cuda engine...we'll see....
UPDATE UPDATE
As mentioned in my earlier comment, I experimented with rendering using non CUDA engine. When I tried with Mercury Playback Engine GPU Acceleration (OpenCL) it failed just as when I do it with (CUDA) To my not so much surprise the render worked fine using the Mercury Playback Engine Software Only which probably explains why I was always able to render without issues using my MacBook Pro late 2012. So for now I have a solution hopefully a temporary one, because it seems as if I can rely on rendering using my iMac and not having to change computers every time I need to render a project. This solution is half satisfactory though as it takes more than 1:30hrs to render a project that using CUDA would take less than 20 minutes.