Index: wp-admin/js/editor.dev.js
===================================================================
--- wp-admin/js/editor.dev.js	(revision 18612)
+++ wp-admin/js/editor.dev.js	(working copy)
@@ -107,7 +107,7 @@
 	},
 
 	_wp_Autop : function(pee) {
-		var blocklist = 'table|thead|tfoot|tbody|tr|td|th|caption|col|colgroup|div|dl|dd|dt|ul|ol|li|pre|select|form|blockquote|address|math|p|h[1-6]|fieldset|legend|hr|noscript|menu|samp|header|footer|article|section|hgroup|nav|aside|details|summary';
+		var blocklist = 'table|thead|tfoot|caption|col|colgroup|tbody|tr|td|th|div|dl|dd|dt|ul|ol|li|pre|select|option|form|map|area|blockquote|address|math|style|input|p|h[1-6]|hr|fieldset|noscript|samp|legend|section|article|aside|hgroup|header|footer|nav|figure|figcaption|details|menu|summary';
 
 		if ( pee.indexOf('<object') != -1 ) {
 			pee = pee.replace(/<object[\s\S]+?<\/object>/g, function(a){
Index: wp-includes/formatting.php
===================================================================
--- wp-includes/formatting.php	(revision 18612)
+++ wp-includes/formatting.php	(working copy)
@@ -174,7 +174,7 @@
 	$pee = $pee . "\n"; // just to make things a little easier, pad the end
 	$pee = preg_replace('|<br />\s*<br />|', "\n\n", $pee);
 	// Space things out a little
-	$allblocks = '(?:table|thead|tfoot|caption|col|colgroup|tbody|tr|td|th|div|dl|dd|dt|ul|ol|li|pre|select|option|form|map|area|blockquote|address|math|style|input|p|h[1-6]|hr|fieldset|legend|section|article|aside|hgroup|header|footer|nav|figure|figcaption|details|menu|summary)';
+	$allblocks = '(?:table|thead|tfoot|caption|col|colgroup|tbody|tr|td|th|div|dl|dd|dt|ul|ol|li|pre|select|option|form|map|area|blockquote|address|math|style|input|p|h[1-6]|hr|fieldset|noscript|samp|legend|section|article|aside|hgroup|header|footer|nav|figure|figcaption|details|menu|summary)';
 	$pee = preg_replace('!(<' . $allblocks . '[^>]*>)!', "\n$1", $pee);
 	$pee = preg_replace('!(</' . $allblocks . '>)!', "$1\n\n", $pee);
 	$pee = str_replace(array("\r\n", "\r"), "\n", $pee); // cross-platform newlines