Hello, So today it turned out that some people had problems with logging into forums. I wasn't getting the error in the past so I wasn't sure what was wrong. I've logged out and to my astonishment - I couldn't log back in as well. So I decided to poke around XenForo's code - I'm not entirely sure why it wasn't working with v0 of API but now I've changed it to use v1 version and it works now. Side effect - you have now "proper" message when you supply wrong password (not really but better than the previous one). Cheers, Furai PS @Stevedog I hope that I've fixed the issues for you.