Hi Dave,
Thanks for the quick reply. Let me try to explain. Over time, I've added a few users to my ignore list.
Today I checked and it looked like two of the users have been removed from the site (i.e. clicking on their username just took me to the member list, rather than to their profile page). So if that was the case, I would have thought they would have been automatically removed from my ignore list, rather than leaving a dead link. As a result, I manually removed the entries from my ignore list.
Hopefully I've explained it more clearly?