He got the same message when he loaded any of our saves from that run in single player, even before I hit the door, it just loaded with the save file while the event that triggered it didn't even happen yet... Think the save file got corrupted...
Anyway we just restarted a new game and now it seems fine, it was totally random... Good thing it was only at the start, would be so pissed if this happened to a higher lvl char :p
So far, connection troubles remain, but I think the hosts ISP is to blame, other games sometimes give timeouts/connection failed aswell :p