Index: wp-admin/network/site-settings.php
===================================================================
--- wp-admin/network/site-settings.php	(revision 17231)
+++ wp-admin/network/site-settings.php	(working copy)
@@ -139,6 +139,8 @@
 			<?php
 			}
 		} // End foreach
+		flush_rewrite_rules();
+		
 		do_action( 'wpmueditblogaction', $id );
 		?>
 	</table>