This is pretty strange.. I am using WordPress MU and this only happens on SOME of the child blogs, although all of them are setup with identical settings and plugins (or so I think)..
On some of the blogs, when I click 'posts' it only shows 'All', 'Published' and 'Trash'. If I disable the Edit Flow plugin, 'Pending' comes back with all of the pending posts. When I re-enable it, pending disappears.