What Andrew is reporting has nothing to do with the brouter app itself...its about Locus.
He only designed a track with the help of the brouter app.
And is saving the resulting gpx tracks to be used later.
So after this generation the brouters app job is finished.
When importing that previous generated gpx file there is a strange issue in Locus.
Weird because the behaviour is different on other tablets or phones.
AND ! Importing that same traject by a tcx file (designed by RWGPS web) also shows that same weird problem.
And only very occasionally on the "Tab Pro" it also does start up more normal.
So for a moment pse forget brouter ...its about loading a file to navigate along that file without any rerouting !
See details about used equipment here: http://forum.locusmap.eu/index.php?topic=5119.msg42947#msg42947
One recorded on the Tab 4: = perfect Navigation start. https://youtu.be/mLvepPBeVDE
One recorded on the Tab Pro: = Navigation start needs a push on the "nearest point". https://youtu.be/DrE796i_yx8