CEA-608 Background should be black, not defaulted to opaque
When someone builds CEA-608 captions, it should default to a solid black BG. On my system it defaults to fully transparent, which quite frankly nobody is going to use for closed captions. It took me quite a while to figure out that transparent is the default, because "background" shows as "black", but you then have to force it to go into opaque mode within the menu. If it's opaque, it should show as "Opaque" rather than "Black", with a feature turned on making it opaque!