I see the same problem. The latest version reports an error in the console log connecting to facebook:
ping?client_id=395202813876688&domain=[DomainHidden].com&origin=1&redirect_uri=https%3A%2F%2Fstaticxx.facebook.com%2Fconnect%2Fxd_arbiter%2Fr%2FhsBwMj6iLmk.js%3Fversion%3D42%23cb%3Df3beb91bdc4c2bc%26domain%3D[DomainHidden].com%26origin%3Dhttps%3A%2F%2F[DomainHidden].com%2Ff3dada4d0f8437c%26relation%3Dparent&response_type=token%2Csigned_request%2Ccode&sdk=joey:1 Can't Load URL: The domain of this URL isn't included in the app's domains. To be able to load this URL, add all domains and subdomains of your app to the App Domains field in your app settings.
The shortcode being used is:
[efb_likebox fanpage_url="[FanPage]" box_width="250" box_height="" locale="en_US" responsive="0" show_faces="1" show_stream="0" hide_cover="0" small_header="0" hide_cta="0" animate_effect="fadeIn" ]
Since this does not include an ‘appId’ (as it is marked as optional), the EFBL plugin assigns a default AppId of 395202813876688. You see this in the header:
<script id="facebook-jssdk" async="" src="//connect.facebook.net/en_US/all.js#xfbml=1&appId=395202813876688"></script>
I think this is the root of the issue I’m seeing.