I just heard of a mixed order active in the USA of which I had not yet heard. They are active in other countries as well. I had listed the group in my page on Equador with another name (more obviously mixed). I have added the below to the respective pages.
Unión Masónica Universal del Rito Moderno (or Universal Masonic Union of the Modern Rite) was founded in Barcelona in 2008. The Union is active in Brazil, Colombia, Equador, Cuba and the USA (California and Georgia). Information on the world wide web does not say as much, but I was asured that the Union has mixed lodges.