Quote Originally Posted by HEC View Post
There is currently a known (not yet confirmed though?) bug where at the brief moment when you access the blacklist to check / amend it the blacklist feature doesn't work for a second or two - that's most likely what happened here as you were addidng the other spammer there at that moment.
This! The one time that a spammer got through on /shout after already being blacklisted was when I happened to be blacklisting someone else.