I have a project that is usually vertically split. When I restart or relogin, then run Scrivener, the second pane will underline words as if they are spelled wrong, even though they are in my user dictionary. If I scroll anywhere else in that file, the other occurences of that word aren’t underlined, but if I scroll back they still are. Switching to another file then back will fix the problem.
Interestingly, this doesn’t occur if I only quit Scrivener then rereopen the project. I have to restart or relogin.