Looks like the number of user actions exeeded the maximum value of the datatype used to store them. See picture. For reference, this was after a 2v2v2 game with one human and one unfair AI on each team, and quit in the middle of the game.
picture does not show in your post (though going to http://lh4.ggpht.com/rkausch/SMRoOQ5qCvI/AAAAAAAABG4/z-se2FUqmHk/user_actions_screen.JPG does show it.
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