The workaround is worse than the symptom! I have Ubuntu GNOME 16.04 with
[AMD/ATI] Bonaire XT [Radeon HD 7790/8770 / R7 360 / R9 260/360 OEM].
I'm running the low-latency kernel, if it matters: 4.4.0-21-lowlatency
#37-Ubuntu

I went into the menu as described, restarted LibreOffice Calc and opened
the spreadsheet. Instead of garbled test, the dialog box was completely
blank. Then ... the screen went totally dark and Ctl-Alt-Delete no
longer worked. I ended up doing a hardware reset.

Are there by any chance some log files I can attach, or do you already
know what this is?

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https://bugs.launchpad.net/bugs/1575000

Title:
   font glyph corruption on dialog box

Status in LibreOffice:
  Unknown
Status in xserver-xorg-driver-ati:
  New
Status in xserver-xorg-video-ati package in Ubuntu:
  Confirmed

Bug description:
  I get a font glyph corruption in various dialog boxes in libreoffice. This 
happens using the following graphic configuration:
    *-display               
         description: VGA compatible controller
         product: Bonaire [FirePro W5100]
         vendor: Advanced Micro Devices, Inc. [AMD/ATI]
         physical id: 0
         bus info: pci@0000:03:00.0
         version: 00
         width: 64 bits
         clock: 33MHz
         capabilities: vga_controller bus_master cap_list rom
         configuration: driver=radeon latency=0

  I don't see this in other graphics (NVIDIA, INTEL).

  Steps to reproduce:

  1. Open for instance LibreOffice Writer
  2. Copy some text to the clipboard
  3. Open the Paste Special dialog with CTRL-SHIFT-V 

  I attach a screenshot of the corrupted font.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xserver-xorg-video-radeon 1:7.7.0-1
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  Uname: Linux 4.4.0-21-generic x86_64
  .tmp.unity_support_test.0:
   
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Tue Apr 26 09:23:41 2016
  DistUpgraded: 2016-03-11 12:35:09,412 DEBUG enabling apt cron job
  DistroCodename: xenial
  DistroVariant: ubuntu
  DkmsStatus:
   virtualbox, 5.0.18, 4.4.0-18-generic, x86_64: installed
   virtualbox, 5.0.18, 4.4.0-21-generic, x86_64: installed
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Advanced Micro Devices, Inc. [AMD/ATI] Bonaire [FirePro W5100] [1002:6649] 
(prog-if 00 [VGA controller])
     Subsystem: Dell Bonaire [FirePro W5100] [1028:230c]
  InstallationDate: Installed on 2015-10-17 (191 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: Dell Inc. Precision Tower 7810
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-21-generic 
root=UUID=63c3c29d-24d9-4ecb-8511-3f2291792bc5 ro quiet splash vt.handoff=7
  SourcePackage: xserver-xorg-video-ati
  UpgradeStatus: Upgraded to xenial on 2016-03-11 (45 days ago)
  dmi.bios.date: 04/14/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A07
  dmi.board.name: 0GWHMW
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 7
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvrA07:bd04/14/2015:svnDellInc.:pnPrecisionTower7810:pvr01:rvnDellInc.:rn0GWHMW:rvrA00:cvnDellInc.:ct7:cvr:
  dmi.product.name: Precision Tower 7810
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz 1:0.9.12.2+16.04.20160415-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.67-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2
  version.xserver-xorg-core: xserver-xorg-core 2:1.18.3-1ubuntu2
  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
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.12-1build2
  xserver.bootTime: Mon Apr 25 08:20:34 2016
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.18.3-1ubuntu2
  xserver.video_driver: radeon

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