Index: wp-includes/class-wp-editor.php
===================================================================
--- wp-includes/class-wp-editor.php	(revision 22402)
+++ wp-includes/class-wp-editor.php	(working copy)
@@ -344,6 +344,7 @@
 					'webkit_fake_resize' => false,
 					'spellchecker_rpc_url' => self::$baseurl . '/plugins/spellchecker/rpc.php',
 					'schema' => 'html5',
+					'extended_valid_elements' => 'table[*]',
 					'wpeditimage_disable_captions' => $no_captions,
 					'wp_fullscreen_content_css' => self::$baseurl . '/plugins/wpfullscreen/css/wp-fullscreen.css',
 					'plugins' => implode( ',', $plugins )