PHP 5.3.3 fails to validate XML against nested XSD's... plz help!

After upgrading from PHP 5.2.8 to 5.3.3, the new libxml_disable_entity_loader(false) function does not seem to work on Windows via command line to a PHP file on a network share. More specifically, DOMDocument::schemaValidate() fails with XSD files that contain multiple levels of nested include()'s to other XSD files on a network share.

The example below leads me to believe that the function call to libxml_disable_entity_loader(false) is not being honored in PHP with XSD files that contain multiple levels of nested XSD include()'s.

Am I missing something here or do you think this is a bug with PHP or possibly libxml?

TO REPLICATE:

Test 1 (success):

"C:\PHP\5.3.3\php.exe" -c "C:\PHP\5.3.3\php.ini" "C:\Temp\validate.php"

The Windows command line example above uses a hard coded path and not a Windows shared folder.
It will successfully echo "passed" in both PHP 5.2.8 and PHP 5.3.3.

Test 2 (fail):

"C:\PHP\5.3.3\php.exe" -c "C:\PHP\5.3.3\php.ini" "\\192.168.82.99\Deployment\Temp\validate.php"

Right-click on your C: drive > Properties > Sharing > New Share > Share name: "Deployment"
Edit the IP address in the command line example above to match your local machine.
The Windows command line example above uses the same files but through a Windows shared folder.
In PHP 5.2.8, it will echo "passed".
In PHP 5.3.3, it will echo "failed" and produce the following PHP Warnings about "failed to load external entity" and "Failed to load the document":

Running the above command line example in PHP 5.3.3 produces:

Warning: DOMDocument::schemaValidate(): I/O warning : failed to load external entity "/192.168.82.99/DEPLOYMENT/Temp/grandparent.xsd" in \\192.168.82.99\DEPLOYMENT\Temp\validate.php on line 8
Warning: DOMDocument::schemaValidate(): Element '{http://www.w3.org/2001/XMLSchema}include': Failed to load the document '/192.168.82.99/DEPLOYMENT/Temp/grandparent.xsd' for inclusion. in \\192.168.82.99\DEPLOYMENT\Temp\validate.php on line 8
Warning: DOMDocument::schemaValidate(): Invalid Schema in \\192.168.82.99\DEPLOYMENT\Temp\validate.php on line 8
failed

FILES NEEDED TO REPLICATE:

Place all these files in "C:\Temp\" (or change your paths in the command line examples)

validate.php

<?php
chdir(dirname(__FILE__));
libxml_disable_entity_loader(false);

$xmlDoc = new DomDocument();
$xmlDoc->load('sample.xml');

echo $xmlDoc->schemaValidate('child.xsd') ? 'passed' : 'failed'; 
?>

sample.xml

<?xml version="1.0"?>
<team mascot="cowboys" />

child.xsd

<?xml version="1.0" encoding="utf-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="qualified" >
  <!-- The include below works -->
  <xsd:include schemaLocation="parent.xsd" />
  <xsd:element name="team" type="baseTeam" />
</xsd:schema>

parent.xsd

<?xml version="1.0" encoding="utf-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="qualified" >
  <!-- The include below fails in PHP 5.3.3 even though libxml_disable_entity_loader(false) is called! -->
  <xsd:include schemaLocation="grandparent.xsd" />
  <xsd:complexType name="baseTeam">
     <xsd:attribute name="mascot" type="mascotNames" use="required" />
  </xsd:complexType>
</xsd:schema>

grandparent.xsd

<?xml version="1.0" encoding="utf-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="qualified" >
  <xsd:simpleType name="mascotNames">
    <xsd:restriction base="xsd:string">
      <xsd:enumeration value="bengals" />
      <xsd:enumeration value="cowboys" />
      <xsd:enumeration value="patriots" />
    </xsd:restriction>
  </xsd:simpleType>
</xsd:schema>

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PHP 5.3.3 fails to validate XML against nested XSD's... plz help!

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