I find that often I am repeatedly unable to buy upgrades for my citadel. Even though I have enough gold, a high enough war rank, and the icon is highlighted, clicking on it has no response (except the noise plays). Often when this happens, I will find I am able to buy one of the other upgrades instead. The mouse cursor does change from the pointer to the other thing when i hover over what I want to buy.
I'm not sure if this is down to lag, or the clicking translating onto something in the main view instead, or something else. I'll post again if I manage to find out anything more.
