Hi, the recommended level color parameters changed to be text code colors rather than html colors to be easier to use as this comes with the color select UI in the plugin manager and also more compatible with other plugins that affect text colors. You will need to set them up again. It should look something like this, where they are all numbers:

If you want to keep the colors you had and they are not already available as text code colors, you can create them with [CGMZ] Infinite Colors and use the id you set in that plugin by swapping to the text tab in the Quest System color parameter.
Thanks for the suggestion, I can add custom images to a future update.