Just picked up a brand new Mid-2014 15-inch Macbook Pro Retina (the one with the NVIDIA GeForce GT 750M). After a few days of video editing, I started to notice some sever artifacting while I was working. This specifically happens whenever OS X switches over to the NVIDIA GeForce GT 750M. I took some screen shots (http://imgur.com/a/AbCR5) whenever the artifacting occurred. Are these signs of a faulty GPU? Should I just return it and get a new one to be safe or is this a common/known issue with this model?