Me and several friends just bought Red Alert 3 on the Steam Summer Sale. We then downloaded the 0.3 beta of Command and Conquer: Evolution mod. We launch the game with the GenEvo Launcher. It's great solo, but every time we try to host and join each other's games, we get "The host has left the game".
We've seen lots of questions about this issue online, but no solutions. Anyone have any ideas?