Public bug reported:

Since upgrading to Ubuntu 16.04 the window borders (including all
control elements such as resize etc.) sometimes disappear on seemingly
random windows at seemingly random times.

I've included a screenshot of what that looks like.

The solutions suggested for similar bugs with Unity don't seems to apply
here since I'm not using Unity (see e.g.
https://askubuntu.com/questions/759150/launcher-menubar-and-window-
borders-disappeared-in-ubuntu-16-04#759735).

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xorg 1:7.7+13ubuntu3
ProcVersionSignature: Ubuntu 4.4.0-66.87-generic 4.4.44
Uname: Linux 4.4.0-66-generic x86_64
.tmp.unity_support_test.0:
 
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
BootLog: /dev/sda5: clean, 886395/23650304 files, 14146638/94594560 blocks
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: GNOME-Flashback:Unity
Date: Thu Mar 16 09:09:51 2017
DistUpgraded: 2017-02-15 09:00:56,527 DEBUG icon theme changed, re-reading
DistroCodename: xenial
DistroVariant: ubuntu
EcryptfsInUse: Yes
ExtraDebuggingInterest: Yes
GraphicsCard:
 Intel Corporation Broadwell-U Integrated Graphics [8086:1616] (rev 09) 
(prog-if 00 [VGA controller])
   Subsystem: Lenovo Broadwell-U Integrated Graphics [17aa:5036]
InstallationDate: Installed on 2016-03-11 (369 days ago)
InstallationMedia: Ubuntu 14.04.4 LTS "Trusty Tahr" - Release amd64 (20160217.1)
MachineType: LENOVO 20BX000UMS
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-66-generic 
root=UUID=6360576f-21d2-4c35-8bba-cc83f79bd9ca ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to xenial on 2017-02-15 (29 days ago)
dmi.bios.date: 05/21/2015
dmi.bios.vendor: LENOVO
dmi.bios.version: JBET49WW (1.14 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20BX000UMS
dmi.board.vendor: LENOVO
dmi.board.version: SDK0E50510 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: 
dmi:bvnLENOVO:bvrJBET49WW(1.14):bd05/21/2015:svnLENOVO:pn20BX000UMS:pvrThinkPadT450s:rvnLENOVO:rn20BX000UMS:rvrSDK0E50510WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.name: 20BX000UMS
dmi.product.version: ThinkPad T450s
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.12.2+16.04.20160823-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.70-1~ubuntu16.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 12.0.6-0ubuntu0.16.04.1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 12.0.6-0ubuntu0.16.04.1
version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-0ubuntu0.2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20160325-1ubuntu1.2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2
xserver.bootTime: Thu Mar 16 08:39:04 2017
xserver.configfile: default
xserver.errors:
 
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id                                4925 
 vendor                                     AUO
xserver.version: 2:1.18.4-0ubuntu0.2

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug compiz-0.9 ubuntu xenial

** Attachment added: "Screenshot of the bug in action"
   
https://bugs.launchpad.net/bugs/1673365/+attachment/4838815/+files/Screenshot%20from%202017-03-16%2008-54-19.png

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which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1673365

Title:
  Window borders disappear with gnome-flashback

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