First off, for whatever reason the body color will always display black even if you've changed the hue. I guessed that maybe it was because of the layout that MADO creates and how it's different, but no, even if i change the part of the skin that would've originally been the window color, it still won't detect it (If i resize the window skin to the default layout it'll just entirely delete the body and leave it transparent too).
So this is what my window skin looks like (showing only the left side as i don't want my skin to be publicly accessible cause it's edited):
MADO doesn't seem to actually touch the upper left corner where the body of windows would usually be, instead it creates a way bigger section and uses it differently.
But as both here are blue anyways, IN THEORY, it should display blue in-game.
Yet, for whatever reason, this is what it actually looks like when playtesting:
It's black. Where did the color go??
The color will only display right in the title screen, but everywhere else it just went to buy milk and never came back.