Index: includes/theme.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/theme.inc,v
retrieving revision 1.415.2.17
diff -u -p -r1.415.2.17 theme.inc
--- includes/theme.inc	10 Dec 2008 21:09:05 -0000	1.415.2.17
+++ includes/theme.inc	25 Feb 2009 18:28:48 -0000
@@ -1866,6 +1866,7 @@ function template_preprocess_page(&$vari
   $suggestion = 'page';
   $suggestions = array();
   while ($arg = arg($i++)) {
+    $arg = str_replace(array('/', '\\', '\0'), '', $arg);
     $suggestions[] = $suggestion .'-'. $arg;
     if (!is_numeric($arg)) {
       $suggestion .= '-'. $arg;