Lately I’ve had trouble with solid red lines (not dotted spellcheck) appearing under certain words.
I’m sure there’s a simple reason why, but I’m hoping tat someone more`scrivener savvy that myself can help me get rid of them and avoid them going forward.
It could be some rogue formatting that got into the file somehow. It looks more like standard underlining (which can have a colour applied to it like that). Have you tried selecting the whole chunk of text and toggling underlines on and off? You can also change the underline colour via the standard Mac font picker (Cmd-T).
[size=80]Adjusting underscore colour using the font panel[/size]