Alex, could you please verify this error about the "Users and Roles" module? Here's the steps:

1- Login as an Admin or Host
2- Add a "Users and Roles" module to a page. (Now you'll see a control titled "My Profile" and another one titled "My Inbox" instead of the "Users and Roles" module controls)
3- Logout. (Now you'll see the three controls of "Users and Roles", ie, "User Registration", "User Accounts" and "Security Roles", and sure no ability to add or edit any setting as the user is anonymous now).

This is a serious problem.