Just to be clear, this issue is not new with Yosemite — it just become more prevalent with Yosemite.
The bigger issue is that most Macbook Pro’s come pre-loaded with NVIDIA graphics cards and this in conjunction with pre-loaded Yosemite means that all of us that are purchasing Macbook Pro’s for video editing with Premiere are buying computers that do not work properly off the shelf.
The only way I’m able to work off my MBP is to shut off the NVIDIA graphics card altogether. This is obviously not acceptable since the reason I paid more for my particular MBP is to have this graphics card.