Why does Ubuntu 12.04 Unity suddenly blur text and images?

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http://askubuntu.com – Today after a reboot, Ubuntu blurs text (well, anything that is rendered on screen) whenever focus changes or on any interactions with the desktop. Example: Normal good look: Blurred state: Note how the text, folders and the plus signs left of the folders are somewhat blurred. In this case, the normal state is after opening the window. Blur happens on lost focus, and gets normal again whenever something is redrawn This applies to anything that is drawn. Even in 3d games, text and thin lines flicker between normal and blurred intermittently, or whenever desktop interaction happens. I (HowTos)