I have had this bug since I installed 16.04 (Not an upgrade)
It does not happen often but when it happens it is always when returning to my 
normal user id after having switched to another user id.

So basically I click upper right corner and selects another user, say user2, 
when I am logged in as user1.
When I am finished with user2 I just log out and am normally returned to the 
login window where I can login as user1 again and the session is resumed.

When the bug strikes it is not possible to login and only a switch to TTYx and 
executing a 
 $ sudo service lightdm restart
will give me back a working login page but I have to login twice before I get 
access and then is of course all work in the old session gone.

nvidia proprietary drivers and dual head.

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