So what is it with the mastery feature? Is it working or not, I've noticed users becoming frustrated with it and no solution forthcoming. Some say you have to log in to your dtl account , log out, log in again, create a new profile then it may work or may not. Some trains tracking on random days and not the next. Seems like it's been a dogs breakfast from the start all the hype and even a livestream all for a lot of faffing about for a couple of scenery changes and backgrounds to look at. Seems like a good idea but the implementation is all wrong and not worth the effort imo.