Thank you both.

I found that when I clicked OK after adjusting the RGB sliders for the catalog colors, both the DSO Catalogs modal and the Catalog Colors modal would go behind the main kStars window. I was never actually clicking all the OKs that I needed to to actually select the colors.

After going through it a few times (because it still doesn't totally stick), the DSOs eventually turned red so yea, it's not bulletproof, but it this is the way to do it and it does work eventually.

Thanks again!

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