Registering manually is what I'm doing, since (so far) there are only a handful this has happened with, and since I am creating a residential community message board to replace a creaky old Yahoo group, the deluge of registrations will be on the front end, over a week or so. If it's on the ReCAPTCHA side, I hope they fix it soon - the old people are already grumpy about having to sign up with a new message board, and getting frustrated at registration is disincentivizing.