Admin Token link produces a blank page

I am trying to create a new admin (PhpList 3.3.1) and I know the system has no place for me to create a password. Instead, it is supposed to send an email to the new admin, with a token link that they follow to create their own password. When the link is sent to the new admin, they click it and the borders come up with the black and grey, but there is no text whatsoever. So there is no way to create a password, or log in.
Any ideas?