Okay, I tried a total hack to see what would happen....
If I delete all the lines in that section but leave the first one, i.e.,
for($i=0;$i<sizeof($que);$i++) { //UBBTREMARK
$xml_string = file_get_contents("http://www.stopforumspam.com/api?email=". $que[$i]['email']);
member management works as per normal. But if I add the next line member management fails as explained.
for($i=0;$i<sizeof($que);$i++) { //UBBTREMARK
$xml_string = file_get_contents("http://www.stopforumspam.com/api?email=". $que[$i]['email']);
$xml = new SimpleXMLElement($xml_string);
So...
The line$ xml = new SimpleXMLElement($xml_string); seems to kill member management. Is it possible my board doesn't know what SimpleXMLElement() is and if barfing there?