Conditional Logic Fields Breaking Form

Hello,

I currently have a form created and it's working great. However, I'm having trouble getting conditional logic working. The form is split into two different pages. The first page has a check box that the use has to tick to agree to our terms and conditions. I'm trying to set conditional logic to prevent the second page from showing without that check box being ticked.

When I enable next button conditional logic on the page break divider, my form simply stops displaying at all on my website. The same thing happens if I enable conditional logic on any of the other form fields.

Any Ideas?

Thanks,
Ben

Note: I'm currently calling the form in a php file using the following code:

<?php echo do_shortcode('[gravityform id=3 name=Contribute title=false description=false ajax=false]'); ?>

Thanks for the quick reply, but I'm sorry, I'm not really much of a coder. I've updated the embed code to the correct syntax below, but I'm having trouble with the gform_enque_scripts code.

I'm getting the following error:
Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'enqueue_custom_script' was given in /home/primeh2/public_html/ophthopedia/wordpressv2/wp-includes/plugin.php on line 405

With the following embed code:
<?php gravity_form(3, $display_title=false, $display_description=false, $display_inactive=false, $field_values=null, $ajax=false, $tabindex); ?>

And the gform_enque_scripts code. This is what's causing the error. I know this is the wrong code, but I'm not sure how to fix it. I'm assuming I'm supposed to call the actual conditional logic script with a variation of this code, but I'm not sure how. Also, what does the 10 and the 2 indicate?:
<?php
add_action("gform_enqueue_scripts", "enqueue_custom_script", 10, 2);
?>

Thanks,
Ben

Ooops. That was silly of me. I now have the following code in my custom_functions.php file in my Thesis theme and the form is now working with conditional logic:
<?php
gravity_form_enqueue_scripts(3, true);
?>

Do you foresee any problems if I just leave it calling from the custom_functions.php file or should I make a hook that makes it call from the header?

-Ben