I was experiencing the same issues – it was very frustrating as it was one particular facebook page that the widget wasn’t working for. I removed the country restrictions under “Manage Permissions” and it is now working fine. I hope this helps you out.
Thank you – I ended up needing to login to the admin section and changing the site URL (Settings > General), the issue would have resolved itself once the name server information was changed to point to the new location anyway 🙂
