For your Message Terminal, if you are using Modulate for the color change, it is ignored when you use a Shader. I don't think I've done a Shader on text before, so I'm not sure how it affects the Font Color, but I'd look there if you come back to this.
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Oh that's really good to know. I can easily add a color uniform to the shader. Thanks!
I was having the same problem with the curved text, and I just let it go, as the color was really only important to me. The player wouldn't notice. I just checked and I'm not using a shader there, and the color worked in the plugin test. I'll have to do some more digging there.