Originally Posted by ddavtian

Yesterday I upgraded X3 to v28, using the latest 2007.1 maps that I had burned a day earlier. Navigation worked fine for few hours then after starting it after some 10 minutes break it kept showing "please wait" for the navigation, for at least 30 minutes I was driving. All other screens worked. I changed to the original dvd with maps, the same thing. I left it alone for an hour, started, Nav was back.

So may be it will come back for you after some time.