? boost-ob.patch
Index: boost.module
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/boost/boost.module,v
retrieving revision 1.3.2.2.2.5.2.132
diff -u -p -r1.3.2.2.2.5.2.132 boost.module
--- boost.module	4 Sep 2009 18:54:37 -0000	1.3.2.2.2.5.2.132
+++ boost.module	5 Sep 2009 01:18:29 -0000
@@ -2244,11 +2244,12 @@ function boost_crawler_run() {
       exit;
     }
 
-    // Set PHP INI Variables, try to prevent crawler from stalling.
+    // Try to prevent crawler from stalling.
     ini_set('max_execution_time', 600);
-    ini_set('output_buffering', 'off');
     // Return html so connection closes
     boost_async_opp('async');
+    // Turn off output buffer.
+    ini_set('output_buffering', 'off');
 
     // Wait 10 seconds if first run and try again (let cron finish).
     if (variable_get('cron_semaphore', FALSE) == TRUE) {
@@ -2394,7 +2395,9 @@ function boost_crawler_run() {
  */
 function boost_async_opp($output) {
   // Prime php for background operations
-  ob_end_clean();
+  while (ob_get_level()) {
+    ob_end_clean();
+  }
   header("Connection: close");
   ignore_user_abort();