Index: wp-includes/pluggable.php
===================================================================
--- wp-includes/pluggable.php	(revision 39878)
+++ wp-includes/pluggable.php	(working copy)
@@ -940,6 +940,10 @@
 	setcookie( PASS_COOKIE, ' ', time() - YEAR_IN_SECONDS, COOKIEPATH,     COOKIE_DOMAIN );
 	setcookie( USER_COOKIE, ' ', time() - YEAR_IN_SECONDS, SITECOOKIEPATH, COOKIE_DOMAIN );
 	setcookie( PASS_COOKIE, ' ', time() - YEAR_IN_SECONDS, SITECOOKIEPATH, COOKIE_DOMAIN );
+
+	// Settings cookies
+	setcookie( 'wp-settings-time-' . get_current_user_id(), ' ', time() - YEAR_IN_SECONDS, SITECOOKIEPATH, null );
+	setcookie( 'wp-settings-' . get_current_user_id(),      ' ', time() - YEAR_IN_SECONDS, SITECOOKIEPATH, null );
 }
 endif;