[mdm] User switch does not work for passwordless accounts

[Rafael Belmonte]

In Linux Mint 16 Cinnamon 32 bits.
I have three users in my home computer, one of them protected by password and with admin rights, and the other ones with no password because we do not need and do not want password for those two user accounts.
Passwordless users can login well when no other users are logged in, but when you have already some user logged in, and you try to use the switch user feature, then MDM asks for password for the passwordless accounts, impeding those users to login.

[Per (perwolf)]

Linux Mint 17,1 Cinnamon 64-bit and the problem remains

[Per (perwolf)]

I would specify that when passwordless user locks screen, there is no way to unlock it. When I press "Unlock", is says "Wrong password". Only way to log back in is by "Switch user" and going to login screen.