Automatically assign sub levels at time of registration

I've created several subscription levels and assigned an access level to each. I've also hooked in the PayPay test gateway.

Everything works fine from initial registration through payment. However, once a new user has paid and registered, he's not assigned a subscription level or access level(despite clicking on one during registration). That is, in the "All Members" area, there's nothing in the subscription/Membership Level columns.

I disabled all other plugins to see if this would resolve the issue, it didn't.

I have people that already paid me to access these pages and content and I have no idea what else to do.

Is there a setting that I've missed that will ensure that when someone signs up–for example, a Basic account–she's automatically assigned to the appropriate subscription level (i.e. basic)?