Test it navigating the entire multipoints route.
Can you see your entire road to drive when it's active?
In active route try to delete a waypoint. may be you set a stop you dont want to respect in your trip.
It should be a route with a unique destination with many multipoints , at least ,this is useful when you plan a route in Mapsource.
Trip looks instead like many destinations routes without intermediate points you must drive one by one and you cant change when active.