I've been trying to set up a co-op campaign with a friend and whenever we try to join each other's game we get the incompatible version message. We have gone in and made sure our mod settings are on the defualt 1x and we get the same message, we also tried different settings, we even tried a MP game and that gave us the same results. We both have v3.3. So are we missing something?

Thanks in advance.