When a username gets banned, they actually don't get deleted from our database. Rather, their account remains but goes into a "Banned" status which means they can't login. It's a long story why I do it that way.
The memberlist has a bug in that it is searching for ALL users, including banned ones. So searching for a banned person in the list will bring them up in the list, but when you click on it you get the "error" and it sends you back to the member list front page.
I'll get this bug fixed so that banned names no longer show up in that list.
