I see now that I had completely mis-diagnosed the problem.  In fact the
problem is that the system is reverting to Unity-2D and if I select
'Ubuntu' at login then it is still using 2D, so the issue is not with
the settings at all (I assume that icon size is not adjustable on 2D).
The system was using 3D before the update.

I see:
$ /usr/lib/nux/unity_support_test -p
X Error of failed request:  BadRequest (invalid request code or no such 
operation)
  Major opcode of failed request:  153 (GLX)
  Minor opcode of failed request:  19 (X_GLXQueryServerString)
  Serial number of failed request:  22
  Current serial number in output stream:  22

which I guess is the problem.

lspci shows
VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RS780D 
[Radeon HD 3300]

$ cat /var/log/apt/history.log
Start-Date: 2014-02-05  17:20:23
Commandline: apt-get dist-upgrade
Upgrade: fglrx:i386 (8.960-0ubuntu1.1, 13.101-0ubuntu0.0.1), lightdm:i386 
(1.2.3-0ubuntu2.3, 1.2.3-0ubuntu2.4), python-apt:i386 (0.8.3ubuntu7.1, 
0.8.3ubuntu7.2), libcurl3-gnutls:i386 (7.22.0-3ubuntu4.6, 7.22.0-3ubuntu4.7), 
jockey-common:i386 (0.9.7-0ubuntu7.11, 0.9.7-0ubuntu7.13), 
liblightdm-gobject-1-0:i386 (1.2.3-0ubuntu2.3, 1.2.3-0ubuntu2.4), libcurl3:i386 
(7.22.0-3ubuntu4.6, 7.22.0-3ubuntu4.7), dkms:i386 (2.2.0.3-1ubuntu3.1, 
2.2.0.3-1ubuntu3.2), fglrx-amdcccle:i386 (8.960-0ubuntu1.1, 
13.101-0ubuntu0.0.1), flashplugin-installer:i386 (11.2.202.335ubuntu0.12.04.1, 
11.2.202.336ubuntu0.12.04.1), jockey-gtk:i386 (0.9.7-0ubuntu7.11, 
0.9.7-0ubuntu7.13), libcurl3-nss:i386 (7.22.0-3ubuntu4.6, 7.22.0-3ubuntu4.7), 
python-apt-common:i386 (0.8.3ubuntu7.1, 0.8.3ubuntu7.2)
End-Date: 2014-02-05  17:31:10

Could it be fglrx?


** Changed in: gnome-control-center (Ubuntu Precise)
       Status: Incomplete => New

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-control-center in Ubuntu.
https://bugs.launchpad.net/bugs/1277013

Title:
  Launcher icon size missing from System Settings, Appearance

Status in “gnome-control-center” package in Ubuntu:
  Invalid
Status in “gnome-control-center” source package in Precise:
  New

Bug description:
  Since a recent update to 12.04 the Launcher Icon Size adjustment is missing 
from System Settings > Appearance.
  The launcher icons seem to have reverted to full size.
  The problem is seen for all users on the machine.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: gnome-control-center 1:3.4.2-0ubuntu0.13.1
  ProcVersionSignature: Ubuntu 3.2.0-58.88-generic-pae 3.2.53
  Uname: Linux 3.2.0-58-generic-pae i686
  ApportVersion: 2.0.1-0ubuntu17.6
  Architecture: i386
  Date: Thu Feb  6 10:50:30 2014
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 
(20120423)
  MarkForUpload: True
  SourcePackage: gnome-control-center
  UpgradeStatus: No upgrade log present (probably fresh install)
  usr_lib_gnome-control-center:
   activity-log-manager-control-center 0.9.4-0ubuntu3.2
   deja-dup                            22.0-0ubuntu4
   gnome-bluetooth                     3.2.2-0ubuntu5
   indicator-datetime                  0.3.94-0ubuntu2

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/1277013/+subscriptions

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