If you look at my app here: http://quiet-brushlands-5712.herokuapp.com/, close to the button is an icon, a glyphicon. But it\'s not appearing on heroku. locally it show as nicel
Because I came to this answer when I was searching I figure I should put here that the solution I came across was to include an import to "bootstrap-sprockets" before bootstrap. This is documented at https://github.com/twbs/bootstrap-sass/issues/653.
I realize the question isn't using bootstrap-sass 3.2+ but I figure this may help someone.