Just thought i'd mention something, I've followed the instructions and played a game as the vikings; the city set seems okay (i can't remember if the vikings get anything other than the basic medieval european cityset... but anyway thats what it is) But the towns/cottages etc don't appear at all, just a blank space on the terrain.
I tried another game as the turks and they're fine though.
When you played as Vikings, with CityLSystem from VD in XML/ Buildings without GlobalDefines, do you get cottages/ towns with an unpredictable mix of architectural elements? I mean, do you see your cottages/ towns with strange neighbours? Medieval European art one side, then the Egyptian art on the other side?
When you do replace Global Defines, do you get blank empty tiles for the supposed cottages/ towns?
And the same thing happens even when you downloaded another file of CityLSystem?
Cause I'm facing this problem and I've gone nuts figuring how to fix it