It seems this bug has carried over from TSW2, in that setting the gradient option to Automatic has no effect upon the gradient display. It will stay at whatever setting (Percentage or Ratio) was last chosen, with the former being the default. Not sure which countries use what, but jumping between different routes has no bearing upon the gradient display in Automatic mode. I would have thought QA would have picked this up straight away when testing the option menu settings (or did they not?)!