I guess this problem is almost fixed. With lightdm 1.7.11 + merged changes from a7x multiseat branch (https://code.launchpad.net/~a7x/lightdm/multiseat) I was able to login every time I tried today, but before loging in I should select correct users on all seats.
If I login in first seat, than on second seat select/change user unity-greeter crashes.
I guess this problem is almost fixed. With lightdm 1.7.11 + merged changes from a7x multiseat branch (https:/ /code.launchpad .net/~a7x/ lightdm/ multiseat) I was able to login every time I tried today, but before loging in I should select correct users on all seats.
If I login in first seat, than on second seat select/change user unity-greeter crashes.