Do you have a Long Term Madness macro anywhere in your campaign - as an ability on a character, for instance? Also, now that you've deleted the macro, what happens when you shift-click on the button? If you cant get rid of it, all i can think is it's some kind of browser caching issue, and you might have to clear the cache. Try opening the campaign in a different browser (if you usually use Chrome, use Firefox), and see if the button is still there.