hi there
everything is ok now.
there was an echo in wp-blog-header.php
thanks a lot
it only has thees lines:
<?php
/* Short and sweet */
define(‘WP_USE_THEMES’, true);
require(‘./wp-blog-header.php’);
?>
i have deactivated all the plugins… still there
i have double-checked the footer.php… no sign of any ok in there :((