I was sent the subscription plugin to test it out for you earlier and it caused some issues but I uninstalled it. I am not sure if that has anything to do with it but I would like to get the site back to working again.
In case of firefox, Press ctrl + Shift + K , It will trigger the Web Console. Or in chrome do the same and Move to the Console Section. And Provide us a Screenshot of the Console. We would like to know, if its happening because of something missing.
N.B: If you uninstalled the Subscriber Plugin beta, Then it shouldn't be a problem anymore.