I just installed the latest MovableType, version 3.12. I appreciate the numerous improvements and bugfixes (especially the bugfix that makes deleting moderated comments much quicker), but, sadly, it broke my MT Blacklist install even though I upgraded that as well. The problem is a known issue, so we'll see how quickly it gets resolved. Should've stuck with the tried and true.

Correction: Blacklist works, I just can't login to it/administer it