In the SCLogin module and the JFBConnect Configuration area, make sure that your "Login redirection URLs" are:
* To a 'real' menu item, and not to an alias or external link
* Not set to "menu_item_root"
Beyond that, the SCLogin module actually uses Joomla to perform the login. If you're entering the normal Joomla username/password and being redirected wrong, it may be something else like an SEF extension causing the problems. Do you have the same problem if you use the mod_login (standard Joomla login) module? If so, that would indicate it's not a JFBConnect issue at all.
Hope that helps,
Alex