Thank you for updating your application. I was able to login using Facebook now and my account was automatically created as expected.
However, I'm not sure what's causing the error on your home page during the logout process. When we change the logout redirection URL in the SCLogin module, the new value isn't being used. The user is always redirected to the home page but that error message is showing. It seems like something else is causing the redirection and not JFBConnect since it's not going where we are configuring it to go to.
Our logout code is being completely revised in the upcoming v5.1 release and should definitely fix this issue since we'll be relying on Joomla's standard logout functionality. That release will be out in the 2nd half of August. Until then, if you're ok with making the following code change, it should fix the logout button. To do so, please edit the /modules/mod_sclogin/helper.php file. Around line 385, you'll see:
function getLogoutButton($useSecure, $jLogoutUrl)
{
if ($this->isJFBConnectInstalled)
{Change that to:
function getLogoutButton($useSecure, $jLogoutUrl)
{
if (false)
{That will use the standard Joomla logout functionality, which should be fine for your configuration.
Please let me know how that goes, and sorry for the trouble.
Thanks,
Alex