The key idea is the same. Turn off the “automatic display” option and instead call the related_posts() function in your theme.
If you’re getting a blank page, there may have been an error in the PHP code you wrote. Try seeing if your server has an error log, or search for WP_DEBUG so you can learn how to debug WordPress theme files.
This sounds like an issue with the layout of elements in your theme. I suggest you ask around for advice on resolving that issue in the “themes/CSS” section of the forums, or by contacting your theme author.
If you use a Theme Framework, like Genesis or WooThemes, then you can add the function Related_posts() to the hook manager of both frameworks. But maybe mitcho could give an example how to include it into a template?