I played 4 matches just 2 hours ago (in freeplay) and they were uploaded almost imediately to the stats site so its not a widespread problem. Perhaps the game has issued you with a new stats code?
I think what had most to do with it was the game host dropped out RIGHT before the scoreboard loaded in. When the game reloaded, our scores were still saved, but not through the system.
I'm not sure if that's even a possibility... I'm merely hoping that was the case and my stats weren't simply lost in the updating of the stat system...