Membership plugin not adding Subscription, Membership Level, or Payment gateway after payment

I am using Membershi Premium Version on Wordpress V 4.1. My problem is that whenever someone completes a subscription payment using the PayPal Payments Standard gateway it does not update any of the Subscription or Membership Level information for their account. The payment goes through with paypal and sets up the subscription correctly but somehow the communication is not getting to the membership plugin. I have read all the previous forms on this topic and tried all the suggested fixes. The Paypal IPN is set up how Membership asks, there are no errors in the IPN history, all membership pages are assigned to different pages, and every access level has some rules. I am at a loss. I really need to get this fixed because it is causing a lot of unhappy customers. I have granted support access if you would like to review the site.