Index: pathauto.inc
===================================================================
--- pathauto.inc	(révision 4875)
+++ pathauto.inc	(copie de travail)
@@ -227,6 +227,9 @@
   $separator = variable_get('pathauto_separator', '-');
   $maxlength = min(variable_get('pathauto_max_length', 100), _pathauto_get_schema_alias_maxlength());
   $output = drupal_substr($output, 0, $maxlength);
+  
+  // Trim duplicate, leading, and trailing back-slashes.
+  $output = _pathauto_clean_separators($output, '/');
 
   return $output;
 }