The problem with setting (any) text colors in MusicBee is that they will usually only work well for the selected skin, and can pose problems when switching to another skin. (especially when switching between light and dark)
Why not just edit the skin(s) you are using to your liking?
I understand your argument and my suggestion was mainly made from my point of view, and I don't switch skins often, if ever, so that wouldn't be a problem for me. But I absolutely see how it would be an issue when one switches skins.
Well, the thing is, the color I chose for one header looks perfect for my classical library but it's not blending in as well with my modern one. You did advise me to use two different instances of musicbee which would have solved this problem had I chosen to follow it, but I didn't so I probably shouldn't complain...