Problem after upgrading 1.71 -> 1.82

I just upgrade from 1.71 to 1.82 and ran into a problem.

Within a short time after I join a lobby, the game get disconnected. This is one of the log message that's output:

Timeout-disconnect! Command: CMD(5 c#:255 r/u: 3/0 st/r#/rt:31938/28/12328) now: 31969 challenge: 74622122

The game was running fine with 1.71. Further more, the game with 1.82 cannot see room created with 1.71, and vice-versa, even though region settings are the same.

Any help would be much appreciated.
David