I seem to remenber having this problem sometimes in 1.14f also:
In the MP set-up screen I've had where some players have decided to leave the game after making it there and then decided they didn't want to play according to some rule or what have you (it really doesn't matter).
Then for some reason I can hear two different audio tracks playing at the same time. Sometimes I hear the normal game set-up audio track being played at the same time of the track that plays when you reach the Industrial Age. That's the one I hear mostly, but sometimes in the past (with 1.14f) I'd hear the one that palys when you reach the Middle Age (along with the normal set-up track at the same time).
The game is locked up at this point (when you hear both tracks); task manager is needed to quit the game.
I'm not so sure that Firaxis isn't putting more resources into developing Civ 4 or other games than they are to fixing this one. MP is the main reason I bought PTW, I hope they can "read' this and get a solution for these MP problems that people are still having.
I've been a dedicated fan of the Civilization series for quite some time now; I'm not sure that my allegiance won't change in the future based upon the level of supoort this game gets right now.