Ultimate Facebook Comments Permissions Problem

Having issues making this plugin and the granting of extended permissions. I've read about the URL from Step 2 and am sure they are the same from the Facebook App area. Ive tried uninstalling, deleting apps, different browers, clearing cache with no luck.

I did previously have a facebook widget installed but have deleted it and the call to it. Is it possible that this is causing the problem?

Is there anything else I can try?