I started setting up Appointment+ on my site last week. Under Settings there were options to offer Discount levels, option to take advantage of marketpress plugin if present and ability to set to payment to sandbox. This week when I go back to the Appointment settings I no longer see those options listed. I've disabled all the installed plugins and deactivated all the add-ons with the exception of Appointments+ with no change those settings are still missing. I am running WP 3.8.3.