Index: query.php
===================================================================
--- query.php	(revision 11082)
+++ query.php	(working copy)
@@ -1815,7 +1815,6 @@
 
 		// Category stuff for nice URLs
 		if ( '' != $q['category_name'] && !$this->is_singular ) {
-			$q['category_name'] = sanitize_title($q['category_name']);
 			$reqcat = get_category_by_path($q['category_name']);
 			$q['category_name'] = str_replace('%2F', '/', urlencode(urldecode($q['category_name'])));
 			$cat_paths = '/' . trim($q['category_name'], '/');