I have a Retina Macbook Pro 15 and installed on parallels Yosemite Beta 4. My VM config is: 4GB ram 4 CPUs 256 Video memory (retina option) VM works fine, but i have problems with screen resolution. If i mark "Retina" at config, i can't change screen resolution at Yosemite, and screen keep very small (print attached). And without retina option, screen is very poor. I want to know how i can fix this. (sorry my english)