Starting July 30th, you will no longer be able to log in to a Curse account that was not merged with a Twitch account. If you have not yet merged your Curse account with a Twitch account, please do so here! Otherwise, your account and its content will be inaccessible.
I think there's some special condition that triggers on the date to do this as I've not had it do this before today, but have seen it all day today on skeletons and zombies. I also had my title text as 'OOoohh, spooky!' with a few more 'o's all day as well.