That's a good one. Never have seen that before. The only thing I could think of that might cause that would be like database corruption, where some rows in the fbb_files table got lost during a repair, because the files would still be on the server, and the links to the embedded files would still work. But without the rows in the database they wouldn't show in the file manager.
That's kind of a long shot though.
Does he have any info about anything special he did? If it happens again, we might need to try to figure out exactly what the user did which might give some clues.
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