Hi, This can be ignored now. Turns out the problem was with the latest version of MDB2 (a database abstraction layer for PHP, version 2.4.0). It wasn't the differences in operating systems/apache/mysql/php which caused my problems, but a simple difference in a PHP file which was more up to date on the Vista machine than the other test machines. Uggh! What a waste of a full day. At least it's fixed. Anyway... no one here cares I'm sure. :) (But just in case anyone else has the same problem... that's how I fixed it). All the best... Conor -- conor.kerr_apache-httpd-users@xxxxxxxx --------------------------------------------------------------------- The official User-To-User support forum of the Apache HTTP Server Project. See <URL:http://httpd.apache.org/userslist.html> for more info. To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx " from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx