[jQuery] Weird form submission problem using validate plugin

[mehodgson]

I have an ajax form in a CakePHP based website that I am trying to
validate using the the jquery validation plugin. Every thing seems to
work just fine on the validation portion, but even when all the fields
are valid the form fails to submit. The weird part is that after the
form is valid and the submit button clicked to no effect, it will
submit if I go and delete the data from a required field and then
click submit again (when the form should not be valid).

Here is my code for the validation:

<script type="text/javascript">
$(document).ready(function() {
        $('#SignUpForm').validate({
           debug: false,
           onfocusout: false,
           onkeyup: false,
           submitHandler: function(form) {
                $(form).ajaxForm(function(data) {
                    $('#signUpBox').html(data);
                });
            },
        });

});
</script>

Anyone have any ideas on how to fix this?