=== modified file 'modules/filter/filter.module'
--- modules/filter/filter.module	2010-06-29 00:48:14 +0000
+++ modules/filter/filter.module	2010-07-25 04:56:59 +0000
@@ -246,8 +246,9 @@ function filter_format_save(&$format) {
     // that anything had changed.
     $return = SAVED_UPDATED;
 
-    // Clear the filter cache whenever a text format is updated.
-    cache_clear_all($format->format . ':', 'cache_filter', TRUE);
+    // Clear every cache whenever a text format is updated. For example,
+    // text fields or blocks might be cached.
+    drupal_flush_all_caches();
   }
 
   filter_formats_reset();