Software has suddenly started substituing Lucida Grande font for whatever I have selected for Scrivenings titles, Headings, and Subheadings. I fixed it and a few days later the same thing happened upon open.
Is the actual preference changing, or is this just something that happens while you are working in the project after a while? Have you noticed it happening with any other projects, or is it limited to just one project.
Another question, you mention this is happening to headings and subheadings as well, to what features do these refer to (since Scrivener doesn’t formally have these things)? What features are you using to create headings and sub-headings and what do you have to do in order to see them end up in Lucida Grande?
One thing I would get out of the way myself, if I were seeing this problem, is to try running with another font for a while and see if it stops happening. It could be there is a problem with the font. Let me know what that is as well so I can test it if it’s a Mac font.