I bought the game when it was in Beta and have been playing since then.  My friends birthday came and decided to offer him Elemental so we could play together in multiplayer mode.  Unfortunately so far, we were able to save only once.  After that, we never could save again.  We tried to remove firewall, put our machine in the DMZ, all to no avail.  One of us saves and after quite a while we get the message about the save being unsuccessful.

The last upgrade really made it playable in multiplayer, but since then we definitely can't save.  As said above, before that we still had problems but at least when he tried to save on his XP, it worked once.

I'm under Windows 7 while he is under XP.  I start the game as administrator.

HELP!