[Plugin: Omni Secure Files] Cannot create directories

I’m using plugin version 1.13 on Firefox 11.0. Everything looks like it’s working well except for the upload UI.

If I mouse over Upload File, I see the URL: http://www.foundationspublicschools.org/wp-admin/admin.php?page=omni-secure-files-menu-root#secure-files-upload

When I click it, nothing happens.

If I mouse over New Directory, I see the URL:
http://www.foundationspublicschools.org/wp-admin/admin.php?page=omni-secure-files-menu-root#secure-files-new-directory

When I click it, it displays the upload file UI.

But I have no way of getting to the UI to create a new directory.

http://ww.wp.xz.cn/extend/plugins/omni-secure-files/