[jQuery] ajax form plugin question

[Shelane]

When a form is submitted - specifically with a file upload - with the
ajax form plugin, firebug doesn't show a submission, nor any return.
This is making it difficult to debug, hince the question.  I know that
my files are being uploaded, but the success function doesn't seem to
be running:

addDoc = function(data){
        $('#docform').resetForm();
        $('#formmodal').jqmHide();
        alert(data);
        stripe('#documents');
        removeDoc('#row' + doc);
}

fileValidate = function(formData){
        if(!document.docform.attachment.value)
                return false;
        else
                alert('about to submit');
}

$('#docform').ajaxForm({success: addDoc, beforeSubmit: fileValidate,
dataType: 'json'});

Am I missing something.