compiz team mailing list archive

[Martynas Pocius <709461@xxxxxxxxxxxxxxxxxx>]

It also happens during classic session. The reason why the dead-zone
disappears for you is because while shutting down, Ubuntu closes all the
windows, including the invisible window that's causing the dead-zone.

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https://bugs.launchpad.net/bugs/709461

Title:
  Application windows can sometimes fail to display and will mask
  regions of the screen