[smcrae]

I have a CTS with the DVD Nav system, and I'm having a problem with it - when I input or select a destination and hit the CALC button, the unit kind of freezes up - it shows the vehicle icon moving on the map, but it does not highlight any route or offer any verbal instructions or turn warnings. Also, it won't respond to any further navigation commands. I can switch to radio, CD, audio menus, but nothing happens when I hit NAV or go to the main menu and select Navigation. The only way to reset it is to eject the DVD and start over.