*** This bug is a duplicate of bug 940603 ***
    https://bugs.launchpad.net/bugs/940603

I am seeing the exact same thing, and have so for a while.  From what I
can tell it has to do with Chrom{e,ium} 18.x and notifications.  The
white box appears when I have a gmail notifications specifically.  I
have been seeing this for a while, and have been trying to figure it
out.  From what I can tell it is not a window as you can click through
it and I can't use Alt-grab to move it.  It simply seems to be a region
of the screen that won't repaint.  Video memory corruption?  Ah, I also
noticed it has a drop shadow, so it kind of acts like a window - or
maybe compiz is simply treating it as one.

For troubleshooting I exited Chromium (18.x) and the white rectangle
doesn't go away.  Even exiting all apps doesn't make it go away.  It
does go away if I logout and back in again.  I then installed the stable
version of Chrome (which was at the time 17.x).  I didn't see this for a
while, but it returned when Chrome was upgraded to 18.x.  Further, I
noticed it appears after a gmail notification comes up.  Specifically, I
had several gmail notifications appears in a row and the white rectangle
appeared.  I exited Chrome, logged out and back in again and tried to
reproduce by having several people ping me in IRC (I am using a web-
based irc client) but couldn't make the rectangle appear.  This morning
I got a single notification from gmail and the white rectangle appeared.

This appears to me to be a problem with Chromium, but I'm struggling to
get good troubleshooting information as I can't get any information on
the "window".

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https://bugs.launchpad.net/bugs/966122

Title:
  White rectangle in top left corner

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