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[Lukasz Olszewski <709461@xxxxxxxxxxxxxxxxxx>]

I experience a very similar bug on oneiric. It happens quite often - every 2 or 3 hours during normal use. I can't give any specific steps to reproduce it but it seems to happen the most when a application with maximized window is started or it's window is minimized or closed. During that time I can't access anything on the current workspace except of unity bars. It looks like something covers a freshly maximized window or desktop when a broken window is minimized. It's is always followed by some graphical distortions (see attached screenshots - on one of them you can see a trail in the left top corner after minimized thunderbird window). Other workspaces are unaffected. Often opening some new window or switching to another workspace and back temporarily fixes this issue.
Using xwinfo reveals that a broken window doesn't get in some way minimized or closed after all! It disappears and it isn't active but somehow blocks everything else on desktop.
This is it's output after minimizing or closing firefox (you can watch it on the movie I've attached):
xwininfo: Window id: 0x281fd16 "Speed Dial - Mozilla Firefox"

  Absolute upper-left X:  0
  Absolute upper-left Y:  53
  Relative upper-left X:  0
  Relative upper-left Y:  0
  Width: 1920
  Height: 1026
  Depth: 24
  Visual: 0x21
  Visual Class: TrueColor
  Border width: 0
  Class: InputOutput
  Colormap: 0x20 (installed)
  Bit Gravity State: NorthWestGravity
  Window Gravity State: NorthWestGravity
  Backing Store State: NotUseful
  Save Under State: no
  Map State: IsViewable
  Override Redirect State: no
  Corners:  +0+53  -0+53  -0-1  +0-1
  -geometry 1920x1026+0-0

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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

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