When Form Manager installed and activated the form doesn't validate and chech required fields. http://www.campbellhoffman.com/form-manager/

!) download and install the Atahualpa theme
2) apply the existing patches

• PATCH 367-01: Odd effects when 'CSS: Compress' = 'Yes'
• PATCH 367-02 is incorporated in PATCH 367-04
• PATCH 367-03: PHP errors when adding widget areas in index.php
• PATCH 367-04: Hovering over a Post/Page title only shows "Permanent Link to"
• PATCH 367-05: Site Title appended after the 'WordPress SEO by Yoast' title

3) activate the theme and test again

After all this is a forum for users of the Atahualpa theme.