Wow, Anne, that is crazy frustrating! I hope third time is the charm.
I think I have a gremlin as well, or rather Creative Fabrica does. The website offers a daily free font or bundle and other goodies. I am a font junkie. If I see a font I must have I go to the designer's page and buy something as a Thank You for their generosity.
I usually use their PayPal link to check out, but this weekend it would not work. I've logged out and in to the site, cleared my cookies and history, authorized 3rd party, restarted my computer, logged in on a different machine. No dice. I can log into my PP account so I don't think the problem is on my side.
C.F's support said they are working on it and could only suggest I pay another way. I limit my Credit Card's online use, so I'll sit this one out and hope they can fix the link.