Due to the change to https roomlisters will not work without some modifications.
Mirc 7
Open the room lister and search for
sockopen roomlister www.buzzen.com 80
and change to
sockopen -e roomlister www.buzzen.com 443
Also find
sockwrite -n $sockname Host: buzzen.com
and change to
sockwrite -n $sockname Host: $+(www.buzzen.com,:,443)
also note depending on your script the sockopen may not be called roomlister. you will have to look around
Mirc 6
Download the two attachments and put the dll's in your mirc directory (where the mirc.exe is) and then follow the above steps