Okay - there's no icon for the thread-level "thumbs up" or "thumbs down" today, for me at least. This is true not only on a page displaying a list of new posts, or the threads in a forum, but also on the "post new thread" page, where at the bottom where you can a select an icon for the title of the thread, there are just the words, no icon! The other title smilies appear to work fine...