Cannot upgrade wall

[LPhillips]

Hi, I'm having a wall-related bug in one of my games. When I attempt to upgrade the wall, the whole wall menu disappears. I can leave and return, then run the wall down and up with the arrows (strange!) and it subtracts money when I perform these false upgrades, but upgrading it higher than its current position is impossible. Resetting the game returns the wall and cash to its original state. The game is 21602.

I reloaded the game to get the number, and gave it a try again just for kicks. It looks like it worked this time. Maybe the bug is only present if you re-open the wall upgrade menu and fool with it again before closing the city menu? I think the problem is that I continued to navigate the city menu after upgrading the wall, while if I had clicked "OK" and closed the whole city menu, this would not have happened.