Chandle

I dig a little bit deeper and maybe a better fix (than modifying stats.php file as described in my original post) is to fix it in wysija-newsletters/helpers/mailer.php file:

Find:

$urlencoded=urlencode(base64_encode($v));

Replace with:

$urlencoded=urlencode(base64_encode(html_entity_decode($v)));

Find:

$urlencoded=urlencode(base64_encode($urlreuse));

Replace with:

$urlencoded=urlencode(base64_encode(html_entity_decode($urlreuse)));