In PHPBB3 how do you get certain groups to see certain items?

In one of the pages, users can only see certain things if they are a user and logged in, as the code under the page is <!-- IF S_USER_LOGGED_IN –>, but, people in two new groups just created can’t see these items? Any ideas please?

Without seeing the whole thing, my first impulse is to say “There’s another tag interfering”.

Many thanks - all sorted.