Appointments+ Login Required Setting not working

Hey,

I'm working on a test site with the appointments+ plugin.

I have it setup and all seems to be working fine except for the "Login Required" setting. I have set this to 'No' but it is still requesting that I login on the front-end of the site to make an appointment. With the message "You need to login to make an appointment. Please click here to register/login: Login"

Any help is much appreciated!