Members not showing in Membership Directory Plugin

I'm using the Members Directory Plugin on a standard WordPress 3.4.2 installation and I'm not seeing any of the site users displayed on the auto-created members page.

I do see the search bar and the "Members" header, but no members.

I read some details about needing to have posted something, or accept a security exception or something?

I really just want all users to have a simple profile displayed on this page (with the potential to add custom member data fields).

Thanks.