Flash POST vars not sending in IE, GET is OK

I can't figure this one out.

I can't get my submit button to work in Internet Explorer. Firefox is fine.
In all browsers, I get all the GET variables OK. When I switch it to POST, IE konks out. It just posts nothing.

on (release) {
getURL("results.php", "_blank", "POST");
}

results.php is just
<h1>Post</h1>
<?php foreach($_POST as $name => $value) {
echo "$name : $value<br>";
} ?>
<h1>GET</h1>
<?php foreach($_GET as $name2 => $value2) {
echo "$name2 : $value2<br>";
} ?>

I can't post any links or more details, but I can't figure this one out. Somehow IE isn't accepting the POST data.

Details:
I'm using Flash CS4 to create a
SWF version Flash 8, Actionscript V2.0

use sendAndLoad() instead.