@menion
Ignoring double tap issue, none of the travel modes (fast car, fast bike, mtb, racing, hike) work first time, whether I just accept the default or select a different mode. After this failure (*without returning to the map screen*), you can either select a different mode or select a different mode and then reselect the previous mode: routing then works.
Edit: 1. In latest beta, double tap issue is resolved.
2. Second sentence above should now read: After this failure (without returning to the map screen), you can either select a different mode or leave the previous mode selected: click on blue button, routing then works.