That link looks like this because you have enabled tracking. The urlid in the link refers to the final url. When a user clicks this link, Acymailing will record a click and a open and then redirects the user to the final url.
I don't know why you end up on a blank page. Can you try to open your concole (F12 in Chrome/Firefox) and see if you get any errors? And can you check if everything works ok whn you disable tracking?