I actually figured out a way to make this membership plugin work with Google check-out, though it is only a workaround. It took going into the mysql database to see what was going on. I will post just in case somebody wants to know. I am using Google checkout. It is a workaround until they fix it the way it should work.
Once the order for subscription was processed through Google (my case) I would then go to the “sales” in e-commerce and go ahead and “accept payment”, noting the users email address. Once I had that, I launched phpmyadmin and accessed the database. Two tables are important here, the “users” table and the “logged_subscription” tables. That is where the user ID’s are supposed to be synchronized. Simply add the user ID for the appropriate user (found in the “users” table) to the “user_id” field in the “logged_subscription” table. The other fields in that table are for the duration of the account (seconds I believe) and 0/1 enable/disable. These latter two should be left alone. At this point you should see the account listed in the “e-commerce subscriptions” tab in the WordPress Admin panel. Hope this helps some. I can’t believe I got it to work with Google.