As you can see after a complet reboot, when you try to open a session
you have an overview of the last windows that was open

** Attachment added: "Evidence"
   
https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1075539/+attachment/3489896/+files/2013-01-19%2012.24.03.jpg

** Tags added: apport-collected

** Description changed:

  If the first user locks his session and the second user tries to open
  his own session, the second user can see images (thumbnails) in the
  screen of the opened windows (applications) of the first user for some
  seconds. This can break confidentiality.
  
  This problem is sometimes reproduced even after restarting the computer
  when the system is trying to start lightdm.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: lightdm 1.4.0-0ubuntu2
  ProcVersionSignature: Ubuntu 3.5.0-18.29-generic 3.5.7
  Uname: Linux 3.5.0-18-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.6.1-0ubuntu6
  Architecture: amd64
  Date: Tue Nov  6 13:39:22 2012
  InstallationDate: Installed on 2012-03-01 (249 days ago)
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111011)
  MarkForUpload: True
  SourcePackage: lightdm
  UpgradeStatus: No upgrade log present (probably fresh install)
+ --- 
+ ApportVersion: 2.6.1-0ubuntu9
+ Architecture: amd64
+ DistroRelease: Ubuntu 12.10
+ InstallationDate: Installed on 2012-03-01 (324 days ago)
+ InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111011)
+ MarkForUpload: True
+ NonfreeKernelModules: nvidia
+ Package: lightdm 1.4.0-0ubuntu2
+ PackageArchitecture: amd64
+ ProcVersionSignature: Ubuntu 3.5.0-22.34-generic 3.5.7.2
+ Tags: third-party-packages quantal
+ Uname: Linux 3.5.0-22-generic x86_64
+ UpgradeStatus: No upgrade log present (probably fresh install)
+ UserGroups: adm admin audio cdrom dialout lpadmin netdev plugdev pulse 
pulse-access sambashare scanner video

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https://bugs.launchpad.net/bugs/1075539

Title:
  Lack of privacy when changing session

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