Probably because people like me have so many users ignored that it literally degrades the server this is hosted on. They had to implement an anti-spam feature that now doesn't allow me to view or edit my ignore list, only add more users to it.
https://bitcointalk.org/index.php?topic=1941829.0 Showing your ignore list may degrade the server, but "having the users Ignore-link color changed based on how many people were ignoring them" should just be a simple SQL query.