Ok, I managed to fix this by looking at the settings from another file that was displaying properly. I noticed that even though the other file was set to the same parents font (default music text font), the font family was Bravura text. I changed this in the other document and it now displays correctly, as it did at first. The problem only arose when I went to change the font size and I didn’t attempt to change the font family. I will attach a screenshot of the correct settings for reference.
