SOAP Error: "Error in my_thread_global_end(): 1 threads didn't exit"

Dear all,

I get the error "Error in my_thread_global_end(): 1 threads didn't exit" when calling SOAP web service. I'm using PHP 5.2.5 in CGI mode on IIS, with the extension=php_soap.dll option.

Interestingly it does seem to call the web service successfully, but then gives said error. Example:

<?php
   $client = new SoapClient('http://bisqwit.iki.fi/jutut/kuvat/ajaxsoapdemo/demo.wsdl');
   $res    = $client->ItemQuery('screwdriver');
   $count  = $res->count;
   $size   = $res->size;
   print "count=$count, size=$size\n";
?>

Gives

count=210, size=116 Error in my_thread_global_end(): 1 threads didn't exit

Any help much appreciated.

Paul