Hi Proconsi,
If our demo page works for you too, please download the latest package and try again.
Latest version downloads http://www.cutesoft.net/downloads/folders/54374/download.aspx
If the latest package did not work for you, please try the way below
1. Open file"\cuteeditor_files\template.php"
2. Find section below and delete it
<link type="text/css" rel="stylesheet" href='<?php echo $vpath ; ?>/Style/SyntaxHighlighter.css' />
Regards,
Ken