I need to revise the documentation for VUWER, because OS X no longer allows blank passwords for user accounts as it once did. Passwords are now required in El Capitan, including standard accounts.
However, the password hint does work for any situation that the thief will encounter. Here’s the trick: you need to add the password hint to your administrative account as well as your guest account. As long as you set your administrative account
so that it requires a login screen after sleep (i.e. the lid being closed), then the thief can either try to log into your admin account (in this case, include a hint that says, “Use the guest account, password is wxyz123”, or he can switch users and get the
hint for the guest account (“Password is wxyz123”).
The only case where he would NOT get a hint is if he was logged into your admin account and tried to switch users by clicking on the guest account name in the upper right hand of the menu bar. But that is clearly not a situation that would realistically
happen - the thief if going to close the lid, stuff your laptop into a backpack, and take off. The next time he opens the computer, he’ll see a login screen.
Tim