Members not appearing in Membership 2 plugin

I've been adding members to a Membership configuration. However, every time I save the member, her or she doesn't appear in the All Members list.

The first procedure I tried is:

1) Click "Add Member"
2) Search for and select an existing WP site user
3) Verify the user profile details auto-filled on the left
4) Click "Save" to save the profile
5) Check "All Members" and notice member not added

So, I followed a second procedure:

1) Click "Add Member"
2) Search for and select an existing WP site user
3) Verify the user profile details auto-filled on the left
4) Select a subscription type then click "Save changes"
5) Check "All Members" and notice member not added

Finally, I tried a third procedure:

1) Click "Add Members"
2) Create a new member in the left side
3) Click "Save" to save the profile details
4) Select a subscription type then click "Save changes"
5) Check "All Members" and confirm member is indeed added

Is there something I'm doing wrong in the first two procedures?