Membership2 Pro providing access prior to payment

Hello,

I've had this same issue on another site. Users are registering for an account through Membership2 Pro. They then appear active in Admin (not Visitor) but with no payment made yet.

I most recently had a user that was "Active" in Admin, but when he tried to pay he said a "Test" sign would come down and not allow him to enter his payment.

Any ideas what this could be? I can't afford to have users gain access to my protected content without paying, or be unable to pay.

Thanks,
Chris