The Knowledgebase has stated that “we currently do not support these higher retina solutions, but will in future updates” for 3 versions now (that I can remember!).
PLEASE Steinberg, roll out a quick resolution and graphics optimization update and make this a thing of the past. There are SO many creatives who want to work within the mobility of their Macbook Pro Retinas, and you guys already have awesome iPad support with your mobile apps so this needs to happen!