Someone I have blocked remains in my 'fans' list - are there problems with Y!A?

It can sometimes take a bit for the system to update and the blocked person to be removed from your fans list. Check your "blocked" list, and if the person appears there, then they are blocked, even though their avatar still shows in your fans. You can try signing out of your account, refreshing yahoo, and signing back in again, and it may push the change through.