I am very happy with your Popular posts tab widget for jetpack plugin and have adjusted the CSS to blend it into my site at http://scallywagandvagabond.com/2014/07/vin-los-canadian-model-tattoos-his-whole-face-wants-to-be-famous/ I see it on some other big sites.
But now I am trying to use the very well known related post plugin called YARPP which has been downloaded over 3 million times. https://wordpress.org/plugins/yet-another-related-posts-plugin/ That plugin won't pull in any results after a few page loads when I have your Popular Posts plugin enabled. After a reinstall it will pull in unrelated results which don't change when you surf to another internal post. Eventually no related posts show at all. We have about 9000 posts and get about 1,800,000 pageviews per month. How might I go about getting the two plugins to work together? I am guessing there is some sort of variable conflict.
I could give you credentials to our development site if you had time to look at the problem though I imagine the same problem exists on any site.