diff --git a/src/wp-admin/includes/media.php b/src/wp-admin/includes/media.php
index 678df7921b..04295dabd6 100644
--- a/src/wp-admin/includes/media.php
+++ b/src/wp-admin/includes/media.php
@@ -1760,7 +1760,7 @@ $post_params = array(
 $post_params = apply_filters( 'upload_post_params', $post_params );
 
 $plupload_init = array(
-	'runtimes'            => 'html5,silverlight,flash,html4',
+	'runtimes'            => 'html5,flash,silverlight,html4',
 	'browse_button'       => 'plupload-browse-button',
 	'container'           => 'plupload-upload-ui',
 	'drop_element'        => 'drag-drop-area',
diff --git a/src/wp-includes/js/plupload/handlers.js b/src/wp-includes/js/plupload/handlers.js
index b7d77dc7bf..2140f0f5df 100644
--- a/src/wp-includes/js/plupload/handlers.js
+++ b/src/wp-includes/js/plupload/handlers.js
@@ -400,6 +400,16 @@ jQuery(document).ready(function($){
 
 	// init and set the uploader
 	uploader_init = function() {
+		var isIE = navigator.userAgent.indexOf('Trident/') != -1 || navigator.userAgent.indexOf('MSIE ') != -1;
+
+		 // Make sure flash sends cookies (seems in IE it does whitout switching to urlstream mode)
+		 if ( ! isIE && 'flash' === plupload.predictRuntime( wpUploaderInit ) &&
+		 	( ! wpUploaderInit.required_features || ! wpUploaderInit.required_features.hasOwnProperty( 'send_binary_string' ) ) ) {
+
+			wpUploaderInit.required_features = wpUploaderInit.required_features || {};
+			wpUploaderInit.required_features.send_binary_string = true;
+		}
+
 		uploader = new plupload.Uploader(wpUploaderInit);
 
 		$('#image_resize').bind('change', function() {
@@ -430,8 +440,9 @@ jQuery(document).ready(function($){
 				$('#drag-drop-area').unbind('.wp-uploader');
 			}
 
-			if ( up.runtime == 'html4' )
+			if ( up.runtime === 'html4' ) {
 				$('.upload-flash-bypass').hide();
+			}
 		});
 
 		uploader.init();
diff --git a/src/wp-includes/js/plupload/wp-plupload.js b/src/wp-includes/js/plupload/wp-plupload.js
index d8476caffd..9f7262c241 100644
--- a/src/wp-includes/js/plupload/wp-plupload.js
+++ b/src/wp-includes/js/plupload/wp-plupload.js
@@ -25,6 +25,7 @@ window.wp = window.wp || {};
 	 */
 	Uploader = function( options ) {
 		var self = this,
+			isIE = navigator.userAgent.indexOf('Trident/') != -1 || navigator.userAgent.indexOf('MSIE ') != -1,
 			elements = {
 				container: 'container',
 				browser:   'browse_button',
@@ -85,6 +86,14 @@ window.wp = window.wp || {};
 			return;
 		}
 
+		 // Make sure flash sends cookies (seems in IE it does whitout switching to urlstream mode)
+		 if ( ! isIE && 'flash' === plupload.predictRuntime( this.plupload ) &&
+		 	( ! this.plupload.required_features || ! this.plupload.required_features.hasOwnProperty( 'send_binary_string' ) ) ) {
+
+			this.plupload.required_features = this.plupload.required_features || {};
+			this.plupload.required_features.send_binary_string = true;
+		}
+
 		this.uploader = new plupload.Uploader( this.plupload );
 		delete this.plupload;
 
diff --git a/src/wp-includes/media.php b/src/wp-includes/media.php
index f038c39838..23fdbc0bcc 100644
--- a/src/wp-includes/media.php
+++ b/src/wp-includes/media.php
@@ -2176,7 +2176,7 @@ function wp_plupload_default_settings() {
 	$max_upload_size = wp_max_upload_size();
 
 	$defaults = array(
-		'runtimes'            => 'html5,silverlight,flash,html4',
+		'runtimes'            => 'html5,flash,silverlight,html4',
 		'file_data_name'      => 'async-upload', // key passed to $_FILE.
 		'url'                 => admin_url( 'async-upload.php', 'relative' ),
 		'flash_swf_url'       => includes_url( 'js/plupload/Moxie.swf' ),