I used to be able to build things in my town, after a few turns, I was not able to build anything anymore - figured that might have been due to being surounded by forest etc., however, the building options were not simply grayed out like usual either.

Not thinking much of this I kept playing on, however, by now a newly conquered (and since razed) city was also not able to construct buildings, and a newly formed city cannot either.

Here is a debug.err: http://dl.dropbox.com/u/9164057/debug.err

Recent Savegame: http://dl.dropbox.com/u/9164057/lala.EleSav

Screenshot 1:

http://dl.dropbox.com/u/9164057/cant_build_1.jpg

Screenshot 2:

http://dl.dropbox.com/u/9164057/cant_build_2.jpg

Sorry, I have no save from before this happened.