Index: includes/common.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/common.inc,v
retrieving revision 1.572
diff -u -F^f -r1.572 common.inc
--- includes/common.inc	1 Sep 2006 08:44:25 -0000	1.572
+++ includes/common.inc	5 Sep 2006 05:37:07 -0000
@@ -1586,7 +1586,7 @@ function _drupal_bootstrap_full() {
 function page_set_cache() {
   global $user, $base_root;
 
-  if (!$user->uid && $_SERVER['REQUEST_METHOD'] == 'GET') {
+  if (!$user->uid && $_SERVER['REQUEST_METHOD'] == 'GET' && !drupal_get_messages(NULL, FALSE)) {
     // This will fail in some cases, see page_get_cache() for the explanation.
     if ($data = ob_get_contents()) {
       $cache = TRUE;
Index: includes/bootstrap.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/bootstrap.inc,v
retrieving revision 1.123
diff -u -F^f -r1.123 bootstrap.inc
--- includes/bootstrap.inc	3 Sep 2006 07:08:24 -0000	1.123
+++ includes/bootstrap.inc	5 Sep 2006 05:37:08 -0000
@@ -317,8 +317,6 @@ function variable_del($name) {
  *
  * Note: we do not serve cached pages when status messages are waiting (from
  * a redirected form submission which was completed).
- * Because the output handler is not activated, the resulting page will not
- * get cached either.
  */
 function page_get_cache() {
   global $user, $base_root;
@@ -582,14 +580,18 @@ function drupal_set_message($message = N
  * @param $type
  *   (optional) Only return messages of this type.
  */
-function drupal_get_messages($type = NULL) {
+function drupal_get_messages($type = NULL, $clear_queue = TRUE) {
   if ($messages = drupal_set_message()) {
     if ($type) {
-      unset($_SESSION['messages'][$type]);
+      if ($clear_queue) {
+         unset($_SESSION['messages'][$type]);
+      }
       return array($type => $messages[$type]);
     }
     else {
-      unset($_SESSION['messages']);
+      if ($clear_queue) {
+         unset($_SESSION['messages']);
+      }
       return $messages;
     }
   }