Transmageddon does not launch

[Felix Oxley]

Ubuntu 15.10

Trying to launch Transmageddon from Gnome Shell has no effect.
From the command line I get this:

$transmageddon
Traceback (most recent call last):
  File "transmageddon.py", line 141, in do_activate
    self.win = TransmageddonUI(self, source=self.source)
  File "transmageddon.py", line 320, in __init__
    self.setup_source()
  File "transmageddon.py", line 1352, in setup_source
    cdrom=theme.load_icon(Gtk.STOCK_CDROM, size, 0)
GLib.Error: gtk-icon-theme-error-quark: Icon 'gtk-cdrom' not present in theme gnome (0)

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: transmageddon 1.5-3
ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
Uname: Linux 4.2.0-16-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.19.1-0ubuntu4
Architecture: amd64
CurrentDesktop: GNOME
Date: Thu Nov 5 21:26:42 2015
InstallationDate: Installed on 2015-10-16 (19 days ago)
InstallationMedia: Ubuntu-GNOME 15.10 "Wily Werewolf" - Alpha amd64 (20151016)
PackageArchitecture: all
SourcePackage: transmageddon
UpgradeStatus: No upgrade log present (probably fresh install)

[Felix Oxley (felix-oxley)]

Making the following change allows Transmageddon to launch:

Tweak Tool > Appearance > Them > Icons switch to Icon set Humanity

Icon set Adwaita (default) doesn't work
Icon set Gnome doesn't work.
Icon set Hi Color doesn't work.

Hi Contrast works OK
Humanity works OK
Humanity Dark works OK