@Rob-Kelley Yes I have but that doesn't seem to make a difference . What DOES seem to make a difference is the setting to navigate the route as a track. Because I just had the following : Edit route shows a proper route but if I go straight to Navigate (after having selected the route from the list) some sections are straight lines but some aren't!
However when I set the setting Navigate as track to OFF the straight lines do not appear other than at the start.