Just thought I would post another bug:
If you go to the page that has been created when you add a user, and press update (feel free to add some content), the parent page will no longer be WP Client File Share and you won't be able to select this from the parent drop down list.
This is a WordPress bug, not a plugin bug, however to get around it, make the page WP Client File Share public (not private). You could then either add some content to this page, or add a redirect to a login page.
While I'm posting here, I would like to add a feature request:
Move everything into a custom post type.
Stop creating a new 'Page' and make a custom post type. This will be much easier to manage / nicer in the admin / you won't need a parent page.