Ok, I've probably found a workaround:
Edit the file /etc/gdm/PostSession (which is executed at logout) and add the 
following line before the line "exit 0":
gsettings set org.gnome.desktop.background picture-uri 
file:///Path_to_your_desktop_background.jpg
The standard backgrounds are found in /usr/share/backgrounds/ if you need to 
know where to start looking.
This seems to solve the problem for me, and displays a black screen during the 
previously mosaic-garbled seconds of the login. But I wouldn't call it a "fix", 
though. And the privacy/security issue should still be looked into. Where is 
this information stored?

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https://bugs.launchpad.net/bugs/931967

Title:
  Corrupted graphics after the login  until the unity launcher appears

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