Index: wp-includes/js/plupload/handlers.js
===================================================================
--- wp-includes/js/plupload/handlers.js	(revision 22829)
+++ wp-includes/js/plupload/handlers.js	(working copy)
@@ -91,7 +91,7 @@
 	}
 
 	prepareMediaItem(fileObj, serverData);
-	updateMediaForm();
+	//updateMediaForm();
 
 	// Increment the counter.
 	if ( post_id && item.hasClass('child-of-' + post_id) )
@@ -124,7 +124,10 @@
 		item.append(serverData);
 		prepareMediaItemInit(fileObj);
 	} else { // New style: server data is just the attachment ID, fetch the thumbnail and form html from the server
-		item.load('async-upload.php', {attachment_id:serverData, fetch:f}, function(){prepareMediaItemInit(fileObj);updateMediaForm()});
+		item.load('async-upload.php', {attachment_id:serverData, fetch:f}, function(){
+			prepareMediaItemInit(fileObj);
+			//updateMediaForm();
+		});
 	}
 }