I'm unsure what is causing the Autotune error, but it seems like our automated tool isn't the only one that gets that:
www.internetmarketingninjas.com/header-checker/ - 406 (same error as Autotune)
Other tools are returning a 200 (correct, OK) code though.. so not sure what's wrong with some automated tools and not others. For Autotune though, I wouldn't worry about it. I just manually checked your page and there are no issues that Autotune would have reported there.
As for the popup, that's coming from JomSocial. I'm not sure why their login popup is automatically showing up at all, but it's definitely their login popup, not one from the SCLogin module or JFBConnect.
Can you tell me:
* What version of JomSocial you're using?
* Do you have any add-ons that are meant to automatically prompt the user to login after a set period of time?
* If you login with standard Joomla credentials (not social network ones), does the popup still appear?
Let us know the above and we'll help how we can. Unfortunately, this really doesn't sound like it's a problem with JFBConnect, so I'm not sure what we'll be able to do.
Thanks,
Alex