I had to disable Table of Contents after upgrading to WP 3.6 and WooCommerce 2.0.13. The tabs in http://www.antoniocabral.com.pt/livros/poesia/antologia-dos-poemas-durienses/#review_form are not clickable now with ToC active. Not really sure which of the two caused the conflict. Hope this is solved soon! It's a handy plugin and I'd like to activate it again.