Index: wp-includes/shortcodes.php
===================================================================
--- wp-includes/shortcodes.php	(revision 6800)
+++ wp-includes/shortcodes.php	(working copy)
@@ -173,6 +173,7 @@
 	}
 
 	$output .= "
+			<br style='clear: both;' >
 		</div>
 ";