Error after loggin with Recognize Devices option

Error after loggin with Recognize Devices option

An unsual error when we loggin with jfbconnect plugin using login with facebook button in different PC.
When we login it's redirected to select Recognize Devices option, after selected recognize devices option it is redirected to broken link www.facebook.com/desktopapp.php?api_key=...&popup=1&error=1#_=_

Attached the screen for references.

Error :

FB Setting authorized devices:

Let me how to fix the issue.

Hi Alex,

It works fine with a recognized (saved) device, but when logging in from a new unrecognized device, and getting the intermediate step to save or not save the device, it doesn't go anywhere after that. Depending on the browser I get a blank page or an error message as attached above.

Another bug has been reported by our client but we cannot replicate it here. It seems that he cannot see the login with facebook button on the site and only gets an unstyled/unclikable "Login with Facebook" text. I can actually briefly see the same unstyled text here before the button is rendered. I have asked him to test it on your site (www.sourcecoast.com/jfbconnect/ ) and there he can see the blue button fine but clicking it doesn't do anything apparently. It happens in IE8 and latest Firefox. Can you think of any reason why? Browser add-ons, browser security settings, things like that maybe?

Another thing, when we installed the plugin the first time, the js file was not included in the head and we had to add it manually as follow:
<script language="javascript" type="text/javascript" src="<?php echo $this->baseurl; ?>/components/com_jfbconnect/includes/jfbconnect.js?v=424"></script>
However, we are still getting the error below:

Which look is the same error we where getting at the very beginning.
Could that cause the issues above? How can we fix this?

Looking forward to your response.

Thanks

Thanks for your help, we have been able to fix the script error we had and get the plugin to work.
However, the unrecognized device bug still occurs, have you been able to do some testing and find a fix?