Thank you very much. However we've been trying to play and so far when we start a game 2 or 3 (out of 3) of us crash instantly with Civ V closing. With pitboss on, we rejoined obviously with a new host but every turn it would resync. This was on Large Islands, with a Small map and 1 AI with the 3 human players.
http://pastebin.com/SRjGeDcs
That's the database.log thing from the thing. It works in single player for all of us (we all loaded it up and played for a couple of turns).
Also my mouse is on never bind to window and yet it is bound to the window until I window key or alt-tab out of it. Not sure if that's related.
Edit: We tried hosting with just one of my friends and me (as the host). It worked fine on turn 1, then did reysync every turn. This is on duel pangea. With my other friend and me (again as host), I crashed instantly while his game loaded up fine (with me missing and able to rejoin as in pitboss). With the same guy, when he hosts and I play again on duel, it instantly crashes for him (same as me the moment the countdown goes to zero Civ V disappears), and I load into the game almost fine (there's a delay where you look at the background rather than a Civ loading screen).
My second friend hosted it for three of us, as the game started the game instantly crashed for my first friend and me.
After reopening Civ we tried to join his game, and both of us got Error Joining Multiplayer. This is with pitboss on to allow for us to rejoin.
The first friend hosted the game. The second friend crashed from it. Me and my first friend stayed in it. After rejoining it resynced every turn until we gave up again.
Edit 2: If there's any multiplayer mod that's more likely to work we're happy to look at other stuff.