I see this corruption while browsing with Google Chrome or Chromium. The white rectangle can be almost the same size as my browser window leaving me hardly enough visible space to open a terminal and run "unity --replace &". I get this ca. once a day with the propriatery nvidia, fglrx and also with the Intel Sandy Bridge driver. I usually get it when I am trying to move chrome/chromium tabs to separate windows or embed a separate window back to a tab. I get this also when I try to open a pdf with the built-in pdf viewer in Chrome. It happens rarely, I can't reproduce it consistently.
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