If you go to
ostlive.com/goodtalktnt/
Which is my development site you'll see that while the login is clearly displayed, when you click on it, there is no email and password field, and the facebook and google icons don't do anything. In addition the whole page appears to fade to a background shade. See screencast.com/t/X4L7mAdJu
1. No email and password - in your SCLogin > Login View Settings tab, you had toggled the "Show Login Form" option to Hide. I switched this back to "Show".
2. The background shade: I just looked at this page again and I think the problem is a conflict with your CSS styling on the page and the CSS styles of our modal popup, specifically the z-index. In my web developer tools in the browser, I changed the z-index of the ".sourcecoast.modal-backdrop" element to 10. That changed it so that the modal can be interacted with. Then when I clicked the FB button, it popped up the appropriate FB login window.
.sourcecoast.modal-backdrop {
z-index: 10!important;
}