As I stated earlier, this relates to attroll adding a new SSL certificate to HF last night. While that adds a layer of security, it has broken a few things as well.
I updated HF's Tapatalk account to reflect the new https address, but they advise that it may take 24 hours to correct itself.
Up to 1 hour delay to update your forum settings to Tapatalk Directory. Up to 24 hours delay to update your forum settings to existing app users .