Perhaps you misunderstood Andy's post. Mailman is part of cPanel. When cPanel pushes another update every server would have to have the patch applied again.
The techs are looking into an issue on your server. That may be what's causing you not being able to access it at the moment. I can access it but it is very slow.
Well I played with it for a while and couldn't come up with a solution. Looks like IE is showing the space a border would take up when it shouldn't.
Maybe someone else has an idea.