Please try using this CVS snapshot:

  http://snaps.php.net/php5-latest.tar.gz
 
For Windows:
 
  http://snaps.php.net/win32/php5-win32-latest.zip

Also provide a SHORT example script. 
(No, PEAR scripts are NOT good test scripts!!)

No feedback was provided. The bug is being suspended because
we assume that you are no longer experiencing the problem.
If this is not the case and you are able to provide the
information that was requested earlier, please do so and
change the status of the bug back to "Open". Thank you.

here is an example: 

class test {

function startElement($a, $b, $c) {
print "start";
}

function endElement($a, $b) {
print "end";
}

function characterData($a, $b) {
print $b;
}

function parse() {
$parser = xml_parser_create();
xml_set_object($parser, &$this);
xml_set_element_handler($parser, "startElement", "endElement");
xml_set_character_data_handler($parser, "characterData");
xml_parse($parser);
}

}

$a = new test;
$a->parse();