fender guy, I've been able to change quite a few colors in x1 when I used it, have you gone in and tried any color changes, not just a couple, like going through several menus changing a few things.
I had the whole background blue and my track fonts yellow and orange for busses,
even more than that, there are quite a few things that you can change.
just because a few of the fan favorites don't work doesn't mean the others don't, give it try.