Rich,
That link isn't work for us either. It looks like we broke that link with the 5.1.0 update, which changed a lot of code on how we get some configuration settings and we missed updating that link.
You'll have to build the link a little on your own. Right now, the link that we're generating is:
https://www.facebook.com/dialog/pagetab?app_id=&display=popup&next=<YOUR HOME PAGE>
The Facebook App ID is missing from that. Go to the Configuration -> Facebook area, and grab your App ID. Then, insert it like so:
https://www.facebook.com/dialog/pagetab?app_id=116488908376294&display=popup&next=http://www.sourcecoast.com/
Update that with your ID and your home page and you should see what you need to see.
I hope that helps, and sorry for that bug,
Alex