Just lost an hour trying to figure out why my sidebar and footer disappeared from single posts.
This time my particular culprit was the Ambrosite Next/Previous Post Link Plus.
I hard coded
<?php previous_post_link_plus('post_name', 'no loop', 'thumb'); ?> <?php next_post_link_plus('post_name', 'no loop', 'thumb'); ?>
in the single.php and then a few days later disabled the plugin... the left over code made my blog go funky.
Just thought I'd share in case others also forgot about the code they put in their single.php and now have a broken page~~