I love this :) No usability errors, just a weird admin one.
On my admin page, I get this in the sidebar.
Warning: include() [function.include]: Failed opening 'license.AGPL.php' for inclusion (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/mysite/public_html/blog/wp-content/plugins/hackadelic-table-of-content-boxes/common/xadm.php on line 94
The file is located in /wp-content/plugins/hackadelic-table-of-content-boxes/common/ and it's readable.
I don't see anything wrong in the xadm.php file where it makes the call, unless it's just not looking in the folder where xadm.php is and needs a more defined path:
<!-- License --><?php if (@!$license) $license = 'AGPL'; ?>
<?php include "license.$license.php" ?>
<!-- /License -->
http://wordpress.org/extend/plugins/hackadelic-table-of-content-boxes/