Hi Gerd,
I am not sure what you did and what "routing doesn't work" means in this case.
My map was similar to the experiments, that you have analyzed here: http://www.mkgmap.org.uk/pipermail/mkgmap-dev/2015q2/023244.html Only I have added relatively small number of non-routable lines with address. This worked correctly until recent releases of BaseCamp, where I get direct routes (straight lines) instead of routes following roads. Problem appears only for "driving" activity (car). When I change activity to "motorcycling" or "trucking", recalculation gives proper routing on roads. I'm not sure if current topic cold lead to similar problems, but I'm cautious about mixing routable/no-routable roads in a single map. -- Best regards, Andrzej