[SMARTY] windows problem with loads of *.tmp files

I've setting up a site using Smarty on windows/IIS/fast-cgi.

There is a shared smartty compile dir .. However this firectory is 
filles up with zero length files with the format wrtXXXX.tmp where XXXX 
is a four digit number

HAve no inkling why this is happening.. and it seems strange its in the 
SMarty dir ??

here's the code for the configuration

define('SITE_KEY','bias_va');

define('SMARTY_DIR', SITE_ROOT.'/libs/Smarty-2.6.12/libs/');
require_once(SMARTY_DIR.'Smarty.class.php');
$smarty = new Smarty();
$smarty->debugging =  true; // only on test server

//** smarty compile
$smarty->force_compile 	=  true; //( SERVER_NAME == DEV_SERVER ); // 
only on test server
$smarty->compile_check 	= true;
$smarty->compile_id 	= SITE_KEY;
$smarty->compile_dir 	= SITE_ROOT.'/smarty_compile_dir';
$smarty->use_sub_dirs 	= false; //f&*( windows



any idea
Pete

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