As talked about in this other desync thread I do think the new netcode may be making certain types of mp game desync situations worse.
It would be interesting to test the following one evening with the same six players: (3v3's seem to stress the engine a whole lot more than a 2v2)
1. Have each player running 1.1 BETA. Try a map with a 3v3 and save the replay (even if it doesn't crash)
2. Try again with the same players except this time running version 1.05 and using port-forwarding.
Same players, Same map, Same systems, Same everything except game-version is key for the above test to have any meaning. 
If I have the time I might try to get this kind of test going this upcoming weekend.
the Monk