I just installed Related posts and it is working. I noticed however that I generally only get one related posts when there is a related post. I have enabled random posts as well. For those I get about 7-10 related posts.
I know related posts gets posts by tag.
All in One SEO writes tags for SEO purposes.
Since SEO generates my tags and then RElated sorts them is there a problem?
I mean everything works but If I wrote my own tags and kept them down to 30-40 tags or so I imagine I’d get more related posts. I have hundreds of tags because of the way All in One SEO works.
I would recommend using my Yet Another Related Posts Plugin for this. It uses a unique algorithm to give relevant results by creating a “score” for each post, considering the number of shared tags and categories but also by looking at the actual titles and content. You can also set a limit on how many posts to display, etc. Give it a try. 🙂