I am running LyX 2.3.1 on OS X 10.13.6 with the latest MacTex distribution. I've also updated the installed packages with TeX Live Manager recently.
Question mark boxes appear next to some menu items in LyX, as in this photo:
Does anyone know why this is happening, and how to fix it? Presumably, LyX is trying to render a symbol that doesn't exist on my system, but I don't see why that would be the case.
I know it's not really a major issue, and I can safely ignore it. However, seeing these symbols really bugs me, so I'd really appreciate it if someone can suggest a way to fix it. I've tried deleting the app and downloading a new copy, but that hasn't helped.
Edit: I can't find any mention of this issue online, so it appears to be just a problem on my system. If anyone here has LyX, I'd appreciate it if you could check what the menu above looks like on your system. You should find it under Edit > Text Style.