Parameter value in hidden fields

[Anonymous]

According to this page : http://community.marketo.com/MarketoArticle?id=kA050000000KyqoCAC#set-a-hidden-form-field-from-a-url-parameter  

Why Commentaire_Prospect hidden field in the following form does not catch "Superhero" parameter value ? http://page.crossknowledge.com/10tips-Mohive-FR.html?Superhero=test1

[Anonymous]

Can you show us a screenshot of your form and of the "Default value"  of the hidden field?