Firstly, I didn't meet window missing bug with the ppa version till now,
but I'm not sure whether it will happen several days later (Just like
what I had said at #43, it took around 4-5 days to produce one window
missing ..)

Secondly, as for the new issue (title rendering problem), I can provide
the following information:

My Physical PC:

$ lspci | grep NV -i
01:00.0 3D controller: NVIDIA Corporation GM107M [GeForce GTX 850M] (rev a2)

$ lsmod | grep nou
nouveau              1495040  0
mxm_wmi                16384  1 nouveau
ttm                    98304  1 nouveau
i2c_algo_bit           16384  2 i915,nouveau
drm_kms_helper        139264  2 i915,nouveau
drm                   360448  11 ttm,i915,drm_kms_helper,nouveau
wmi                    20480  3 msi_wmi,mxm_wmi,nouveau
video                  40960  3 i915,msi_wmi,nouveau

-------------------------------------------------

Open gnome-terminal (or firefox / nautilus / gedit or any other apps
that can support multi tab-pages), and confirm that

1、Makeing the window maximized
2、Using Composite Manager

Then, Ctrl + Shift + T to generate a new tab page, then switching it
will leave the edge shadow of each charactor in the title unerased, like
what I had shown in the above image.

I have tested that,

1、without composite manager, this issue (edge of each title charactor is
unerased) doesn't happen, even when the window is maximized.

2、If the window is not maximized, this issue also doesn't happen, even
when  Composite Manager is enabled.

3、this issue doesn't happen inside my created virtualbox, even if this
virtualbox runs on my current metacity session, with composite manager
enabled.

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to metacity in Ubuntu.
https://bugs.launchpad.net/bugs/1538111

Title:
  untraceable serious bug in metacity 3.18

Status in metacity package in Ubuntu:
  In Progress

Bug description:
  Ubuntu 16.04 LTS uses 3.18 version of gnome metacity.

  When doing lots of mess work in Desktop (such as open desktop window,
  sudo window, dragging window, and so on), "!! WHEN CLICKING CLOSE
  BUTTON OF A CERTAIN WINDOW !!", there is "small possibility" for
  metacity to get out of work --> Many windows are disappeared, with
  only nautilus desktop background and gnome-panel on screen. "Live
  Window List" still exists in gnome-panel, but no matter doing what
  (such as open new application from gnome-menu or use Alt+Tab to switch
  window), none of live windows can be displayed.

  So the only way is to switch to tty1 using Ctrl+Alt+F1, and executing
  "DISPLAY=:0 metacity -c --replace", then all windows came back.

  Till now, I meet this bug every day, but still not sure how to
  reproduce it bug. I think you should trace what the metacity do when
  clicking "close button" that makes all windows to be disappeared.

  Thanks.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: metacity 1:3.18.1-1ubuntu3
  ProcVersionSignature: Ubuntu 4.3.0-7.18-generic 4.3.3
  Uname: Linux 4.3.0-7-generic x86_64
  ApportVersion: 2.19.3-0ubuntu3
  Architecture: amd64
  CurrentDesktop: GNOME-Flashback:Unity
  Date: Tue Jan 26 19:49:48 2016
  SourcePackage: metacity
  UpgradeStatus: No upgrade log present (probably fresh install)

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