If you added a new account, depending on your before/after age of accounts factors it's possible that your score could have dropped 5-10 points easily and even as many as 20-25 points under certain circumstances. That being said, if the score gain that you received from the utilization paydown (assuming you did actually receive one) was equal to the loss from the age of accounts factors being reduced, in theory you could end up with a net gain/loss of 0 points.
Without knowing more about your before/after age of accounts factors and your individual card utilization along with aggregate utilization before/after, it's tough to say.
