Had this problem yesterday and the only way to resolve was to uninstall the app and the offline UK Map. Logging out did not resolve the problem when logging back in.
Re-installed again and tried the "Sim" mode again to see if it was a one off.
Same issue again. When I go to any of my routes and click navigation there are never any way points and the screen displays no distance or arrival time.
When using "Sim" Mode however it does simulate navigation and all waypoints, distance and arrival time display.