I have a form like this.
As discussed in comments, there is no bug, at least on the last version of jQuery 2.0.3, one can test with this:
<html>
<head>
<script src="//ajax.googleapis.com/ajax/libs/jquery/2.0.3/jquery.min.js"></script>
<script>
$(document).ready(function () {
$('#dosubmit').on('click',function(){
$("#hiddenForm").submit();
});
});
</script>
</head>
<body>
<?php
//
if(count($_GET) > 0) {
echo "<textarea style=\"width: 700px; height: 90px;\">
Submitted with method=GET: \$_GET:
";
var_dump($_GET);
echo "</textarea>";
}
if(count($_POST) > 0) {
echo "<textarea style=\"width: 700px; height: 90px;\">
Submitted with method=POST: \$_POST:
";
var_dump($_POST);
echo "</textarea>";
}
?>
<form id="hiddenForm" method="post" enctype="multipart/form-data">
<input type="hidden" id="HiddenFormInput" name="HiddenFormInput" />
</form>
<div id="dosubmit" style="background-color: gold; width: 200px; cursor: pointer;">Click me to Do jQuery Submit</div>
</body>
</html>
When one clicks on gold background text, $("#hiddenForm").submit(); is used to submit the form.
Here is the output:
Submitted with method=POST: $_POST:
array(1) {
["HiddenFormInput"]=>
string(0) ""
}
In your original form, no URL arguments are passed by the submitting, as only inputs with name attribute specified are submitted. So I added the attribute name="HiddenFormInput" for your hidden input.