Fix for form on top of the page

Using the shortcode in a post or page places the form on top of the page.

Using

http://wordpress.org/support/topic/plugin-called-via-shortcode-appears-at-the-wrong-place-on-post

and

http://01241.com/04/09/plugin-called-via-shortcode-appears-at-the-top-of-the-content/

ob_start(); has to be added after line 123:

function pf_shortcode($args = array()){
    ob_start();
    global $pf_errors;

And

$paypal_fields = ob_get_clean();
return $paypal_fields;

after line 208:

echo '</form>';
$paypal_fields = ob_get_clean();
return $paypal_fields;
   }
}

http://wordpress.org/plugins/paypal-forms/