Urgent: "Invalid token" when trying to login!

I just tested with the Login menu item that looks to be using the Hello Me module. When I entered test / test as the username and password I got the Invalid Token error message as well.

That means it doesn't seem to be a SCLogin specific issue. I'd recommend trying the following to see if it improves things:
* Disable Joomla caching in the Global Configuration area
* Turn off any 'optimization' plugins you may be using
* Turn of SEF URLs

Try each one and see if there's an improvement. Then, you should hopefully be able to narrow down where the conflict is.

I hope that helps get you started. Again though, I don't think this is an SCLogin or JFBConnect issue.

Thanks,
Alex