IE8 doesn't support runtime html5 in plupload, defaults to html4 runtime for IE. upgrading to newer plupload then solved IE specific problems setting a form's content type.

application/Bootstrap.php

@@ -57,7 +57,6 @@ class Bootstrap extends Zend_Application_Bootstrap_Bootstrap
 		$view = $this->getResource('view');
 		$view->headScript()->appendFile('/js/libs/jquery-1.4.4.min.js','text/javascript');
 		$view->headScript()->appendFile('/js/libs/jquery-ui-1.8.8.custom.min.js','text/javascript');
-		$view->headScript()->appendFile('/js/libs/stuHover.js','text/javascript');
         $view->headScript()->appendFile('/js/libs/jquery.stickyPanel.js','text/javascript');
         $view->headScript()->appendFile('/js/qtip/jquery.qtip-1.0.0.min.js','text/javascript');
 

public/js/airtime/library/plupload.js

@@ -1,15 +1,17 @@
 $(document).ready(function() {
+    var uploader;
 
 	$("#plupload_files").pluploadQueue({
 		// General settings
-		runtimes : 'html5',
+		runtimes : 'html5,html4',
 		url : '/Plupload/upload/format/json',
 		filters : [
 			{title: "Audio Files", extensions: "ogg,mp3"}
 		]
 	});
 
-	var uploader = $("#plupload_files").pluploadQueue();
+	uploader = $("#plupload_files").pluploadQueue();
+
 	uploader.bind('FileUploaded', function(up, file, json) {
 		var j = jQuery.parseJSON(json.response);
 

public/js/libs/stuHover.js

@@ -1,35 +0,0 @@
-/* ================================================================ 
-This copyright notice must be kept untouched in the stylesheet at 
-all times.
-
-The original version of this script and the associated (x)html
-is available at http://www.stunicholls.com/menu/pro_drop_1.html
-Copyright (c) 2005-2007 Stu Nicholls. All rights reserved.
-This script and the associated (x)html may be modified in any 
-way to fit your requirements.
-=================================================================== */
-stuHover = function() {
-	var cssRule;
-	var newSelector;
-	for (var i = 0; i < document.styleSheets.length; i++)
-		for (var x = 0; x < document.styleSheets[i].rules.length ; x++)
-			{
-			cssRule = document.styleSheets[i].rules[x];
-			if (cssRule.selectorText.indexOf("LI:hover") != -1)
-			{
-				 newSelector = cssRule.selectorText.replace(/LI:hover/gi, "LI.iehover");
-				document.styleSheets[i].addRule(newSelector , cssRule.style.cssText);
-			}
-		}
-	var getElm = document.getElementById("nav").getElementsByTagName("LI");
-	for (var i=0; i<getElm.length; i++) {
-		getElm[i].onmouseover=function() {
-			this.className+=" iehover";
-		}
-		getElm[i].onmouseout=function() {
-			this.className=this.className.replace(new RegExp(" iehover\\b"), "");
-		}
-	}
-}
-if (window.attachEvent) window.attachEvent("onload", stuHover);
-