I have reported this problem to the Admins. Surely I'm not the only one getting it? (I'm putting the image here because it's not possible to attach an image to a PM unless the attachment already exists on FF. No idea why.)
Please note: Once payment is made you need to send a private message to wicked at the forum, stating your username and the email address you used to pay. If you do not do this your upgrade will be delayed, the upgrade will be done within 12 hrs.