The exact cause of the bug is not clear to me, i have pruned my code down to something that reliably causes it both in cli and web server version.

To reproduce (i hope) put .php and .xml files in same and execute in cli mode, it should crash as it completes.

Dr watson writes a dump file i can retrieve that if requested.

I am running unmodified win binaries 4.2.2 as distributed.

The two files are...
--- crash.php ---
<?php

function findNode($Doc, $TagName, $AttrName, $AttrValue) {
	$nodes = $Doc->get_elements_by_tagname($TagName);
	reset($nodes);
	while (list($key, $value) = each($nodes)) {
		if ($AttrValue == $value->get_attribute($AttrName))
			return $value;
	}
	return null;
}

function save($XmlFile, $Username, $GameId) {
	!$doc = domxml_open_file($XmlFile);
	$user = findNode($doc, 'user', 'username', $Username);
	echo ">";
	if ($user)
		$games = $user->child_nodes();
	echo "<";
}
echo "php:" . phpversion() . " domxml:" . domxml_version() . "<br />\n";
for($i=0; $i < 40; $i++) {
	save("crash.xml", "abc", "x");
}
?>
--- crash.xml ---
<?xml version="1.0" encoding="UTF-8"?>
<users>
  <user username="abc">
    <game id="game0"/>
    <game id="game1"/>
    <game id="game2"/>
    <game id="game3"/>
    <game id="game4"/>
    <game id="game5"/>
    <game id="game6"/>
    <game id="game7"/>
    <game id="game8"/>
    <game id="game9"/>
    <game id="game10"/>
    <game id="game11"/>
    <game id="game12"/>
    <game id="game13"/>
    <game id="game14"/>
    <game id="game15"/>
    <game id="game16"/>
    <game id="game17"/>
    <game id="game18"/>
    <game id="game19"/>
    <game id="game20"/>
    <game id="game21"/>
    <game id="game22"/>
    <game id="game23"/>
    <game id="game24"/>
    <game id="game25"/>
    <game id="game26"/>
    <game id="game27"/>
    <game id="game28"/>
    <game id="game29"/>
    <game id="game30"/>
    <game id="game31"/>
    <game id="game32"/>
    <game id="game33"/>
    <game id="game34"/>
    <game id="game35"/>
    <game id="game36"/>
    <game id="game37"/>
    <game id="game38"/>
    <game id="game39"/>
  </user>
</users>