According to blockexplorer you have recieved coins earlier, so I assume you're not using MyBitcoin to lose them. I suggest running bitcoin with -rescan to see if it fell between the cracks. It has solved the same problem for me and at least to one other person in this thread.

And the stats might be gone because with the payment queue the oldest coins in your balance might have been more than a week old, so it could be that the stat page thinks you've been away for more than a few days since it can't find any coins that are less than a week old. But that's just a guess.