On 2 occasions, the Nav screen on my 2012 E70 has started with a solid reddish/orange screen. A few seconds after start up, the screen changes to solid black.
The Radio, phone, etc were working, the screen was just black. Everything stayed this way through several restarts over the course of the day. The next morning, the nav screen started up normally and worked fine.
I suspect it is the video card (or whatever BMW calls it) going bad.
The tech at the dealer has been very good. He is opening a Puma case to get more information. I'll keep you updated on the results.