If you generate a new map for a multiplayer game and you give the game the same name as a previously created game the map doesn't get re-sent to the client's PC. The client will use the map that is in their maps folder for OLD game with the same name. The server side player, however, will be running the new map. Obviously, this causes problems since the players are seeing different maps for the same game. The only way to fix this is to have the clients delete the save game folder for the game and delete old map from the maps folder (or create all new games with unique names.)
One other small problem with multiplayer: When my friends firewall was not set up correctly, we got a message saying "Bad neighbor" and some Swedish stuff when we tried to play the first turn. I think this should say "Cannot communicate with client" or something more meaningful.
Other than this bug I have played three games online without any problems. The multiplayer system seems to work well.
