Any user other than a System Administrator must be assigned to positions in order for them to view the positions.
Here's how you can do that:
1. Go to Admin-Users
2. Click the name of the user you'd like to assign (if the user has not logged in, click Pending User)
3. In the user's profile, click Assignments
4. Select the positions you'd like the user to be able to view
5. If the user should see all of the positions, you can click the very top box, and all of the "children" will be viewed