If you have troubles since the update to WordPress 4.5 please read this post before opening a new thread.
If a Post is connected to more than one Category, the related posts Slider is not showing up. What can I do?
Are you sure? I specify two categories for a post and the related entries show properly. Can you give us a link to your website?
Related posts has nothing to do with categories actually. Relations are pulled from common *tags* and not the categories.
You can see the code for it in includes>related-posts.php .
So you just need to add some tags to your posts and the theme will then output the related posts based on common tags.
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