After some testing with the latest version this morning i have found several issues:
Navigation crashes after few hundred meters(log attached) however after restart it never finishes calculating the route even if the target is just around the corner. In some cases it also stops drawing the map. It's also impossible to stop navigation-the stop button is always in the menu.the blue globe keeps turning without end.The only cure is to exit the app with X in the main menu and restart.
The other problem is if the route is calculated from given start point without gps signal. The navigation direction arrow disappears but the meters to the next turn are displayed which looks quite odd. See attached screenshot.
Hope this feedback is useful.