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[Bojan Markovic <709461@xxxxxxxxxxxxxxxxxx>]

If you are still interested in this bug I have an almost guaranteed way
to reproduce it. But it's slightly demanding of your work environment,
since it means using MATE desktop environment and replacing it's WM
'marco' with 'compiz'.

Once you have this Compiz/Mate combo running, you need to open a few
windows (I typically have >10 various applications open so this bug hits
me often).

If you minimize al windows, using for example panel Show Desktop Button
or a keyboard shortcut defined in CCSM (I have Super+M setup to minimize
all windows) you will almost certainly create one of those "ghost"
windows that are clickable and block access to desktop icons and
sometimes even windows below them, but are invisible.

If you want the nasty version of the bug (where a window even disappears
from taskbar so you cannot remove it any way but sucessfully guessing
where it's close button is located) try tampering with CCSM options
Enable Widget Layer.

Minimizing by clicking the taskbar button instead of window's minimize
also hels bring this vermin to show it's face.

-- 
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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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