What this plugin does: It brings up related posts in your blog and adds them with a link to the bottom of each post. It's a nice thing to get your readers to click around and explore more of your blog.
But...even though I used the latest version of this plugin hoping that it was not buggy this time, it still messed up my blog such that it barely would open in a browser.
If you have having issues with your blog in Wordpress.org, try deactivating one plugin at a time to isolate your problem. And start with YARPP. Another buggy one is Google Analytics (any of the versions according to a nice help desk guy at Blue Host).
Type A Parenting for the Modern World
I blog on parenting, education and children's literature