Forum $vboptions[bburl] = Blank?
 

Got an odd problem since upgrading our forum from 3.8.7 to 4.2.0

When an email is sent out, which includes $vboptions[bburl], it doesn't actually display or add the boards URL

So notifications for private messages for example, look like this:

"To read the original version, respond to, or delete this message, you must log in here: /private.php"

Notice it's missing the domain/url before /private.php

Any idea where or why it might be missing that off?