We were also able to reproduce this behavior (changes being overwritten) when both users were editing without being logged in. Since we have an internal wiki we made login mandatory before editing pages to avoid this problem (and because many people were asking for it anyway), but that of course is not possible on many installations. Michael Richards PS http://meta.wikimedia.org/wiki/Require_users_log_in_to_edit Gartnerpedia Installation: Suse SLES 9 Linux Apache 2.0.49-27.8 MySQL 4.0.18-32.1 PHP 4.3.4 Mediawiki 1.3