The recently released WPBlacklist 2.0 version had a few bugs which made the plugin work quirkily or worse yet, present the user with a stream of error messages when they tried to post a comment after certain URLs had been harvested by the new mass-deletion facility. So, I’ve released WPBlacklist 2.01 to fix these problems. You can download it from here.
In the meantime, I’m working on WPBlacklist 2.5 which will allow auto-deletion of spam comments and an e-mail notification facility for comments which are automatically deleted. Hopefully, I should be able to release 2.5 in a day or two