Sebastien, thx - I've uploaded hopefully the stuff you suggested.

Initially I tried using the "Print Screen" button - but as soon as I 
pressed it, the desktop screen fixed itself!  :-(

Stephen

On 14/12/2020 10:12, Sebastien Bacher wrote:
> Thank you for your bug report, could to a screenshot or video showing
> the issue it's a bit difficult to understand as described. Please also
> include the 'journalctl -b 0' log after triggering the issue. Nautilus
> doesn't handle the desktop anymore so reassigning to gnome-shell which
> is a better start point for rendering issues
>
> ** Package changed: nautilus (Ubuntu) => gnome-shell (Ubuntu)
>
> ** Changed in: gnome-shell (Ubuntu)
>     Importance: Undecided => Low
>
> ** Changed in: gnome-shell (Ubuntu)
>         Status: New => Incomplete
>


** Description changed:

  More generally, desktop mis-displays
  
  3 Variations:
  
  a)
  0) open a window/app
  1) minimise a window/application, causing Desktop to be visible
  2) move cursor to dock (to open new app)
  
- As soon as cursor hits dock, the graphic of the minimised window
- (graphic that would be shown by activating "Activities") appears. It can
- be cleared by sweeping a window over the desktop. It only happens once,
- once for every time you minimise a window.
+ As soon as cursor moves over the dock, a small version of the graphic of
+ the minimised window (ie what would be shown by opening "Activities")
+ appears. It can be cleared by opening another window and sweeping this
+ over the desktop. It only happens once, once for every time you minimise
+ a window.
  
- b) Click "Acivities" - then click again to restore view
+ b) Click on "Activities" then click again to restore view
  As soon as cursor hits dock, desktop goes corrupt (large parts blank out)
  
  c) Close window
  As b)
  
- By attempting to move an icon on the Desktop, the Desktop repairs
- itself.
+ By attempting to move an icon on the Desktop, or pressing "Print Scrn"
+ button, the Desktop repairs itself.
  
  
  Ubuntu 20.04.1 LTS
  Gnome 3.36.3
  64-bit
  
  nautilus:
    Installed: 1:3.36.3-0ubuntu1
    Candidate: 1:3.36.3-0ubuntu1
    Version table:
   *** 1:3.36.3-0ubuntu1 500
          500 http://gb.archive.ubuntu.com/ubuntu focal-updates/main amd64 
Packages
          100 /var/lib/dpkg/status
       1:3.36.1.1-1ubuntu2 500
          500 http://gb.archive.ubuntu.com/ubuntu focal/main amd64 Packages
  
  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: nautilus 1:3.36.3-0ubuntu1
  ProcVersionSignature: Ubuntu 5.4.0-56.62-generic 5.4.73
  Uname: Linux 5.4.0-56-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.13
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Dec  6 12:11:40 2020
  InstallationDate: Installed on 2016-09-01 (1556 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 
(20160719)
  ProcEnviron:
   LANGUAGE=en_GB:en
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  SourcePackage: nautilus
  UpgradeStatus: Upgraded to focal on 2020-12-05 (1 days ago)
  usr_lib_nautilus: dropbox 2018.11.08

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https://bugs.launchpad.net/bugs/1906977

Title:
  moving cursor to dock causes desktop graphic garbage

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