I have been having issues where the game freezes in my offline game expeditions. Don't know why, doesn't happen all the time, but it does get annoying. especially when I have more than one modifier in action. Has also happened when I use a map modifier. That really sucks because I lose everything I put into it. The only way I found to exit the game after it freezes, is to use ctrl+alt+del and restart the computer. I don't like that you can't alt+tab between the game and windows.