I went through the configuring s2Member to work with WP Affiliate, and thought I did everything correctly. Ran the test as they suggested, and the click thru was recorded, but sales wasn't.
Here is my login page: http://www.bobwp.com/wpstarters-affiliates/
Here is my affiliate landing page: http://www.bobwp.com/wp-starters/
Anything else you need to help with this? Thanks!