The "View Fields" privilege is required during form design. The "View Fields" privilege doesn't exist by default and must be manually created and added to the role. This is true for my installation, and for the web demo.
The web interface prompts for another user to log into the system who has appropriate privileges.
The catalina.out log has the following error...
WARN - RequireTag.doStartTag |2008-06-26 15:59:13,484| The user: 'Adeline Az
rack' has attempted to access: /admin/forms/field.list which requires privilege: