[Plugin: Social Discussions] Pinterest button pop up not showing image

Just installed Social Discussion on a clients website and everything is working except for the pinterest button, when you press the button you get the pop up but the image window is blank. You can fill out the text area and choose a board but when you click pin it nothing happens.

I have set featured images on the site so there should be something. Any suggestions on what else I need to check.

Thx

https://www.ads-software.com/extend/plugins/social-discussions/