Yuo Related Posts not showing up on non-admin sites…

After installing and configuring Yuzo – Related Posts, all appears good on my administrative site. Everything works as it should.

But when I go onto my site as a public user (non-administrator) without using an administrator password, the related posts don’t appear after posts (or anywhere else) and the functionality seems to be absent. This means my readers aren’t benefitting from the functionality of the widget.

Please advise. This is a serious issue for me.

https://wordpress.org/plugins/yuzo-related-post/