So most of the development today was, in fact, debugging.
Then I realized that another bug, that was supposed to be fixed months ago (client/server map syncronization) is still there. Not the same bug that bothered me in the winter/spring, but a bug that affects the same code. This really sucks, because, well, that code is kind of complicated, and BIG! And I don't even know if it's the client or server's fault.
Well, at least my buildings to cities integration works fine. Now I just have to build on it, add new building types, etc.