Authorize.net doesn't work

[mycroftt]

Can't renew my membership. Authorize.net just keeps returning an error message:

The following errors have occurred.
(99) This transaction cannot be accepted.

 

[Spark]

It's working for most people - we had a bunch of new subscriptions last night.

I need more information from you in order to troubleshoot this problem. First Name, First initial of last name, time you attempted to subscribe, and credit card type.

 

[knifenerd]

I've had the same probs. Amazing, since I've been a gold member since the concept started a few years ago, and now it's one roadblock after another--first "wrong currency selected" and now "error 99".
In the "old days" this was a real simple process with a master or visa card.