I have a similar issue. After update from 2.3 to 2.4 I see a blank page into the admin panel and blog page. I have added the code <?php wp_related_posts(); ?> manually in my function.php. After I have remove the update from the server and upload/make active an old version of this plugin again, I have access to my admin panel and see my blog again. Version 2.3 worked very well, only 2.4 makes problems. Unfortunately I have a very old version (1.2) saved on my hard drive, is there a way to have the 2.3 version back?
