It seems this might be something to do with the new Ambiance and Radiance themes. If I switch to the Clearlooks theme, the terminal background is properly solid with no transparency when Solid Colour is selected, which is the expected behaviour.
It seems this might be something to do with the new Ambiance and Radiance themes. If I switch to the Clearlooks theme, the terminal background is properly solid with no transparency when Solid Colour is selected, which is the expected behaviour.