Been using a related post plugin for years (think it's the first one ever made, authors Alexander Malov & Mike Lu, domain it was from long dead) and today realised if you create a custom nav menu and change the title of the post links the related post plugin will use the new title to generate a link to a non existent post (the excerpt is from the right post mind you, so it's the anchor text and URL).
I'm running with SEO friendly permalinks, I assume this wouldn't be an issue with the default dynamic URLs.
You can see an example at http://www.stallion-theme.com/stallion-seo-theme-comment-title-feature see the first related post entry where I'd added a link to this page to a nav menu and shortened the title to Comment Titles.
Been looking for a new related post plugin and the Contextual Related Posts Plugin this one has the same bug.
To test this, make a custom nav menu, add a posts to it and rename the title. Go to that post and you'll find a link like I showed above: you'll find link to the post with the nav menu link anchor text and the wrong URL.
Guessing no ones noticed this behaviour, any thoughts on a fix?