I did a search and came across a thread which had to do with underscore colour, but I wasn’t sure if it applied to this case or not, so …

I’m working on a manuscript originally imported from Word for the past several weeks. I mostly write in fullscreen mode, white text on a black screen. Mostly the underscores have been fine and coming up as white, but now they come up as black even when the letters are white - meaning they’re invisible to me the way I have things set up. Any way around that?

Ah. Figured it out. Not sure how, but it came back, so there you go.