[resolved] Conditional form only appears using shortcode not using function call

I have a form with a dropdown conditional field.
When I use the shortcode in the page it appears and works OK.
When I add a function call e.g. <?php gravity_form(1, false, false); ?> to a page template instead of the shortcode it does not display.

The function call works if I remove the conditional form elements.

It appears as though the javascript isn't being generating in the head of the page when a conditional form element is used with a function call in the page template. The form code is viewable in the page source but display is none.

I have tried this on several different server environments.

What do you think?

Thanks Kevin for your answer. That makes perfect sense.

As a suggestion could you add a link to the http://www.gravityhelp.com/documentation/embedding-a-form/ page in the admin Gravity Forms Help page as there is no mention about extra required code only "Add the following function call to your template" <?php gravity_form(2, false, false); ?>.