In the "Current Login Sessions" page of the Usermin Configuration module, the links in the "Unix user" column appear to be invalid. Instead of the usual "/useradmin/edit_user.cgi?user=username" syntax, the link address contains something like "/useradmin/edit_user.cgi?num=27", causing the "Create User" page to be displayed instead of the expected "Edit User" page.
Thanks - this will be fixed in the next Webmin release.