I found
your other thread
and I am still having that problem. I do not get past that login form to see an OAuth error.
Do you have any redirection extensions set up on your site like SH404? If I try to go to
"/index.php?option=com_jfbconnect&task=authenticate.login&provider=facebook&return=L2NvbXVuaWRhZC9hY2NlZGVy&08bc9721f679128cab2faaed0fe6f3e5=1" it always gets redirected to "/comunidad/acceder" This is not normal behavior. If you'd like me to look into this, it might be easiest if you send me super admin credentials in a PM (you can send a private message using the envelope icon under my avatar)
-Melissa