[solved] CLicking on 'login with facebook' will not work.

You don't appear to have an AppId specified in the Facebook API tab of the configuration area. Can you verify that you've entered the API Key, App ID, and Secret keys according to the configuration guide below:
www.sourcecoast.com/jfbconnect/docs/configuration-guide?start=1

That should fix you up, but if not, let us know!

Joost,
We've heard of one other case where a user wasn't able to save his configuration settings, but never obtained access to that user's site. If you could private message me a super admin account details, we'd love to investigate further. You can PM me by clicking the arrow under my picture (<---) and hitting the mail icon. Also, please send your App ID and Secret key so we can test with those.

Thanks!

Joost,
I'm not sure why, but the JFBConnect database tables were never created on your site. This is why you can't save your settings.. because there's no where to save them too. I'd recommend re-installing JFBConnect which should try to re-generate the tables. If that doesn't work, you can try to import the install.jfbconnect.sql file in the /administrator/components/com_jfbconnect directory.

If you know of any reason that database tables aren't being created, that would be great to know. We've never heard of this issue before, so would need to know more information about your site and server to determine why it's happening.

I installed DBReplacer which allows us to look at the tables in your database. The ones missing are:
jos_jfbconnect_config
jos_jfbconnect_user_map

Hope this helps get you started, and any information you can provide would be great to have.