Ok the game seems to work pretty fine. But I have two problems:
1) Every time some enemy besieges me on one of my citadels and I click to play the battle myself, the game crashes (CtD). That doesn't happen when I play a custom battle. Also, I didn't have the oportunity to besiege an enemy. I already installed the bug fix in another thread but it didn't do anything.
2) I can't upgrade my guilds to headquarters. I trained plenty of priests, thiefs, assasins, etc but I can't upgrade to their guil headquarters. The same goes for the swordsmiths guild etc.