*** 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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