[Radek]

This seems to be a problem of the game, at least partly. I haven't experienced problems with the game itself but I have experienced problems with the editor: suddenly, the editor becomes sluggish, everything lasts for years, and when you try to quit then you don't quit - the computer hangs instead and you get the message "the application isn't responding" in the end. Luckily, if you have saved the mod, then the mod is really saved and you aren't losing anything.
There is something stinking in the logic of the game and the editor. There are more problems with the game:
1. I am often not able to escape the introduction animation. When you are writing a mod then it prepares you for a madhouse rather quickly.
2. It happens often that the mouse is confused after quitting the game. Left click behaves as right click, and you have to right click several times before the mouse resets to a resonable behaviour.
I am patched to 1.02.0722