Due to an issue with snakeyaml, the § character used in the minecraft color codes was not always reading in correctly. This was resulting in an unknown character showing in game instead of the actual color code.
Instead of using the special character, now using #COLOR.<color>#. For example, it is now #COLOR.RED# instead of §4
This resolves the issue and hopefully makes it more obvious what colors are being used, without the need to look them up each time.