I read this thread for the 1st time a couple days ago...the very next day my car did it to me!!!!How's that for a coincidence???
I had the defroster on when I shut her off to get gas. Got back in and started it, the defroster was still blowing but the display was blank and the buttons wouldn't do anything. Since I had read this already I just turned the car off and back on and it was normal. It hasn't done it since.
Odd.....