Why does the same widget look different when used by MoviePlayer vs just manually adding to viewport?

Thanks for the response! So when I mentioned in my original post that I created an identical SVirtualWindow hierarchy, I did exactly what you mentioned in steps 1-6 and they still look different. So I guess it has got to have something to do with the fact that it is rendered via the slate renderer like you mentioned in your final point. I was trying to avoid attempting to mimic the rendering code but I guess that is the only thing left I haven’t tried…