If you didn’t already get a solution, the problem posted here is the same. It should work if you make it a paged query.
http://wordpress.org/support/topic/previous_posts_link-next-page-re-displaying-same-post-twice
Thank you so very much! It was as easy as installing the plugin and defining my custom field’s ID in the following line of code:
<?php echo c2c_get_custom('media'); ?>
Thanks again!
-Michael
My current permalink structure is /%post_id%/%postname%/