Thumbnails not showing

A couple of weeks ago the slider stopped showing images on my site. It shows an icon but no image. However, when you click on each icon it goest to the correct image on instagram (which is how I have it set). I’ve seen similar threads and people say it’s “magically” fixed. I’ve removed the widget and added it again, and I’ve waited over a week and still nothing. Please help.

https://wordpress.org/plugins/instagram-slider-widget/