I am playing on version 4.16.2 of VP (I am reluctant to upgrade past this point because I do not like the new unit supply city penalty). There is a small but annoying bug that prevents workers from using the Route To method when building roads. The builders lose focus after completing each segment of road and ask for new orders. I do not know how or where this functionality is handled. Could anyone give me some pointers on how to solve this problem?