This is the error message I got:
Fatal error: Call to undefined function wpcf7_add_tag_generator() in /home/suppeoc/public_html/_suppe/wp-content/plugins/contact-form-7/modules/text.php on line 152
As you see there is a problem in conjunction with the plugin 'contact form 7' which is wildly used out there. The normal 'add category' feature works fine, so not a super big deal. Just FYI ;)
Really cool plugin thanks for this!