Data from "multipart/form-data" discarded

For some reason, on just one server, data from forms posted with ENCTYPE="multipart/form-data" never makes it to the PHP script. We use this extremely simple test script: <form method="post" enctype="multipart/form-data" action="<?= $PHP_SELF ?>"> <!--<form method="post" action="<?= $PHP_SELF ?>">--> <input name="textbox"> <input type="submit"> </form> <pre> <?= var_dump($_REQUEST) ?> </pre> And on this one server, no output shows unless the first <form> tag is commented and the second uncommented. On all other servers, with apparently identical configuration, form data appears normally. The build on this server (PHP 4.1.2) is extremely simple: ./configure --with-apache=../apache_1.2.23 --with-mysql Any ideas? miguel