Multiplay Stability re. Save Games

[theCzar]

firstly, I'm using C3C on win xp on broadband over a router. My friend with whom i'm trying to get a good game going is using PTW but is otherwise the same as myself. I play using the PTW executable

With no small measure of effort, we've overcome router probs and port forwarding to the point where we can start a game, we can get right into it, play a few turns but it seems as soon as i try and save the game, my friend's game crashes soon after.

Additionally, if we try and load a game he crashes as well.

if anybody has similar probs/soloutions, could you let us know!

[Terra Nullius]

just a stab in the dark, but civ will only allow one machine in a multiplayer game to be behind a firewall.
if you both have firewalls in place, that might be causing the problem