OK fine, i am not a specialist, but finally I have found the solution on google and your forum in fact. It's a problem of script :
Wordpress | Thumbnail Resizer (timthumb.php) Problem
this code give us the solution in the script.
}
$fileSize = filesize ($cache_file);
$buffer = file_get_contents($cache_file);
ob_get_clean();
ob_start();
header ('Last-Modified: ' . $gmdate_mod);
header ('Cache-Control: max-age=9999, must-revalidate');
header ('Expires: ' . $gmdate_mod);
header ('Accept-Ranges: bytes');
header ('Content-Type: ' . $mime_type);
header ('Content-Length: ' . $fileSize);
echo $buffer;
$sContents = ob_get_contents();
ob_end_clean();
echo $sContents;
}
thanks a lot for your reply