The xml files for the corresponding characters are still in the appropriate folder, but they stopped showing up in the actual application. I've restarted the application several times and even tried using the Import feature and navigating to the xml files of the missing characters - receiving the error message that they are invalid characters. I was just working on them literally an hour and a half ago and saved and printed them and nothing has changed. Also, all the remaining characters are all suddenly displayed as being at negative 30XP for no explicable reason.

Genuinely no idea what to do.