I'm having complete system lockdowns which seems to be GPU related. After powering up the system I even get a message that there was a graphics error. This happens when I run Premiere Pro CC few times a day it's annoying trying to do the work. I am using Mercury playback engine w/ CUDA drivers v. 6.5.18 which should be compatible with OS X Yosemite (at least that's what is on Nvidia's page). This is my crash report: Any idea how to fix this?