7
Ok, I think I have found the problem. All your users are still there Tic: Oaksy, Tiddles, and so on. Except that for the users you can't see, they don't have filled in the 'name' field.
Remember the new authentification system requires to have 3 level login: name, username and password.
In your case, any users having left the 'name' field blank, seems to have diseappeard.
What can we do in this case?