My fb login stopped working this morning!

On my website: www.theperfectworld.com the login stopped working this morning? It has been working just great for weeks...
I have tried to locate the problem (it might be Facebook..?) but have run into a wall. What can I try?
I have found one thing I don't know is related but it looks wrong and I don't know how to change this. On the overview it lists:

Application Name: The Perfect World
Site URL: dev.theperfectworld.com/
Site Domain: theperfectworld.com

Where can I change the dev.theperfectworld.com/ .. ? This is a left over from the change from development to production site.

Ok I solved it.. I added Facebook details to JomSocial this morning.. that made it not work. Read in another thread that JomSocial facebook fields should be empty