As I noted on duplicate bug 933917, Radiance is also affected, not just Ambiance. If you look closely, you can see that the white used for some menus / submenus in Radiance are not the same white as what is supposed to be used. Those are the same menus affected under Ambiance. (A screenshot meant to point this out is provided on the aforementioned bug report in comment #2.)
As I noted on duplicate bug 933917, Radiance is also affected, not just Ambiance. If you look closely, you can see that the white used for some menus / submenus in Radiance are not the same white as what is supposed to be used. Those are the same menus affected under Ambiance. (A screenshot meant to point this out is provided on the aforementioned bug report in comment #2.)