Could you tell me specifically what error message you are getting and what specific URL you are visiting? Could you provide more details on what you're seeing? For example, does is there a message saying it's attempting to log in via Facebook or another social network but failing.
Since I didn't see the SCLogin message anywhere, I went to your forum page to log in via Facebook. I was able to log in successfully with no looping. I then closed the page and re-opened in a new tab and also did not see a loop. Please provide more details as I cannot reproduce anything out of the ordinary.
-Melissa