Rodz,
Can you let me know a page where we can see the issue? If the page comes up with the black shadow box, but nothing displays, it's an indicator that either:
* There's a Javascript error on the page that's preventing some SCLogin functionality from working
* There's some CSS problems on the page causing the login box to be hidden.
Either way, we'd need to be able to see the page to diagnose the problem further.
Thanks,
Alex