Things you need to do
1. Check rhoelements: app_type included in build.yml
2. If you are trying to use Hourglass from controller then you can specify for the actions which has navigation as below
Hourglass.visibility = 'false' #this will hide the spinner
WebView.navigate(url_for(:action => :my_action, :controller => :my_controller))
if you need to use for all actions in the controller, we can before filter like below
Hourglass.visibility = 'false'
Hope it helps