Returning to Empty Cities.

[Zoyd]

Just getting back into the game and I know there have been a lot of changes. The more recent changes seem to have removed all of my buildings. I managed to build a basic mine to gather stone but the city is not showing on the city list. I still have a flag standing where the town square used to be but there is no square? I used the build window and tried to demolish it to place a new flag but there is nothing to destroy. I then tried to use a new flag but nothing happens. I have 4 flags in my inventory and none can be used/placed. All I have left of the cities are the roads. The only city that shows up on the F12 window is the one I had in the Babylon system. 

Any help will be greatly appreciated.