WOW! I’ve solved the problem with black values on black background!
It was pretty hard but I did it!
Ok. If someone needs the solution:
I realised that Cubase uses system fonts, Arial family to be exact. So I checked the fonts book app in my mac and found that this very font had been turned off. I’m not sure how it happened, some bug in my mac or bug in Cubase but I simply turned it on and voila!!!