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
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