Can't Export Properly Anymore

All of a sudden Scrivener won’t export files properly. I tried to export a large project, but only a few of the files were in it. I tested a subfolder with about 14 files, but it would only export about 3 of them. I tried exporting as plain text, rtf, and PDF, and both System code and UTF-8, and still only about 3-5 files out of the 14. It’s as if Scrivener doesn’t recognize that certain files exist. Yet the export feature says it will export 14 files and 1 folder. I tried rebooting my computer, and the problem persisted.