I haven't used Premier in a while. Today I started working on a project and it doesn't work anymore. This is what the preview is now like:
I have the latest version of Premiew Pro (Adobe Cloud) on a Macbook Pro Retina.
I am on Windows, but a couple of saved discussions may help
Mac & nVidia Driver http://forums.adobe.com/thread/1075592
Mac Retina Bug http://forums.adobe.com/thread/1159632