I get an initial screen that offers a demo mode. I can not make this screen go away. After bypassing the demo mode, everything esle functions properly, except:

My vehicle dymanics "are not available at this time." They are available when I am stopped, but the accelleration indicators never work - the vehicle isn't moving.

I have an '08 GMG Sierra half-ton.

Any ideas or hints to cure these problems?

In the nav menu go to settings and then to demo mode and you can turn it off

I think I tried this already, but giving it one more shot won't hurt.

Cheers!