Here’s the solution to the 2nd problem I found with TOC Boxes. The problem is that if tags are included within the <hN> tags, by mistake or on purpose, they are not stripped from the TOC elements, thus modifying the TOC look with unwanted extra tags.

For example, I found my own blog posts that had <strong> and even <img> tags within the <hN>.

Feel free to integrate this patch for v 1.5.1 into trunk:

Index: wp-content/plugins/hackadelic-table-of-content-boxes/hackadelic-toc.php
===================================================================
--- wp-content/plugins/hackadelic-table-of-content-boxes/hackadelic-toc.php	(revision 109810)
+++ wp-content/plugins/hackadelic-table-of-content-boxes/hackadelic-toc.php	(working copy)
@@ -198,7 +196,7 @@
 		$anchor = sanitize_title( $match[2], $anchor0 );
 		$this->headers[] = array(
 			'level' => $match[1],
-			'text' => $match[2],
+			'text' => strip_tags($match[2]),
 			'href0' => "$this->url#$anchor0",
 			'href' => "$this->url#$anchor",
 			);

http://wordpress.org/extend/plugins/hackadelic-table-of-content-boxes/

Artem
http://beerpla.net
http://twitter.com/ArtemR