Cubase opening in Low Resolution

Since downloading Cubase Pro 8.0.20 my cubase is opening in low resolution mode - looks like crap!
My MacBook applcation of Cubase ‘Get Info’ shows the Low Resolution box ticked but greyed out so I can’t untick it.
Could you tell me what I need to do to improve the resolution?

Apparently Cubase doesn’t support Retina Display on MacBooks.