Seems to be the standard process lately to not automatically approve new accounts.
Just wait it out. It usually takes less than 24 hours. You can submit a ticket asking them to fast-track it.
They should probably change the wording on that message though if this is going to happen every time someone signs up. This: "We had a problem automatically approving your account." sounds a tad ominous...as if you personally did something wrong or they found you were using a stolen credit card or something.
In reality they probably do not automatically approve any accounts (anymore)...why not make a different welcome email explaining that so people do not feel like something needs to be done to correct problems!?