We have a wordpress website that is up and running and there is a bug with the Membership Plugin http://wordpress.org/extend/plugins/s2member/
We offer 2 Memberships (same monthly payment fee) : Normal and Professional
Both Membership are required to pay 1euro per month as a membership fee.
What happens is that when a Professional register and pays with Paypal his account is not created and he doesn't have access to the website. He doesn't receive a Welcome message, he can't login etc.