Cannot get rid of fictional buddies

[alexolog]

When I login to the web interface of YIM, it shows me one active conversation, one entry under "start a new conversation", and 25 entries under "Invite your friends to Yahoo Messenger". Obviously I am only interested in the first one, but the plugin creates 39 buddies, which includes all of the above plus many duplicates (like a nickname and an email address of the same person), and keeps recreating them on the next login when deleted.