If you are using single use tokens to control access to your quiz, you might find your users reporting that the token was expired even though they had not attempted the quiz.
It is possible that your user’s virus checkers are checking the token as it appears as a link in an email and therefore are “using” the token.
You should be able to get round this by sending your users a link to a standard Question Writer quiz login screen, and giving them the quiz id (generated by Question Writer Tracker when you create tokens) as the user name and the token code as the password. As the token is just text in the email it should not attract any attention from the virus checking software
eg:
Quiz Log In: https://www.
UserName: 12345
Password: X3GZ9KA377T8EDMX
