Yep. Tried that already. No difference between SafeMode=ON/OFF.
When I look into the doaddgraemlin.php page and echo out the
$graemlin_temp = $_FILES['readpost']['tmp_name'];
echo "<html><body><h1>'".$graemlin_temp."'</h1></body></html>";
$graemlin_temp is empty. It seems that the file is not uploaded.