Unity does not provide login box when desktop is locked, sometimes

[grinch]

Sometimes when I come back to my locked computer, i am not able to login. There is no box to login with.
I have tried typing login details and tried clicking where login box should be, but neither work

a picture of what is shown may illustrate the issue best. I will attach one as a file to this bug report

Same picture is also hosted 3rd party: http://i.imgur.com/dLB25NY.jpg

[Andrea Azzarone (azzar1)]

Are you using a multimonitor?

[grinch (grinch)]

Yes. Neither monitor shows login box.
When it is working the login box will switch to whichever monitor has focus, which is why I made sure to capture the mouse pointer in my picture, to show that monitor had focus

[Andrea Azzarone (azzar1)]

Ok. Can you post the outout of:
apt-cache policy unity

[grinch (grinch)]

unity:
  Installed: 7.2.3+14.04.20140826-0ubuntu1
  Candidate: 7.2.3+14.04.20140826-0ubuntu1
  Version table:
 *** 7.2.3+14.04.20140826-0ubuntu1 0
        500 http://us.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     7.2.2+14.04.20140714-0ubuntu1.1 0
        500 http://security.ubuntu.com/ubuntu/ trusty-security/main amd64 Packages
     7.2.0+14.04.20140416-0ubuntu1 0
        500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages