Events+ integration with Membership Problem

Set up a recurring event which repeats every week on Mon, Wed and Fri from April to October in 2013. The event status is open, and it is a paid event (£5) with a capacity of 20. I have the membership integration plugin on, and have set any combination of Membership fees and prices, and cannot get any member discounts to work. I have tested with Paypal Sandbox extensively. What have I missed? Any suggestions?