I have the standard 'Discover Media' and my main screen went blank yesterday, not while driving though. Couldn't get it switched on at all. I drove about 40 miles, stopped, started, etc., and still nothing. Then when I returned home I pressed the lock button twice this time on the fob, reopened, started ignition and the screen came back on but with the wrong sat nav location! I then locked the car and noticed the speedo dials etc., were lit up and didn't turn off! I opened and closed (locked) the car and they finally switched off.
I've only driven about 700 miles and hopefully this is just a glitch, but doing a quick internet search it appears that the blank screen issue has been a general problem for VW for some time.
I will keep you posted if it happens again.