This has happened a few times now - I'll have a DVD-R mounted (filled with backup files) and suddenly when I click on one of them, it'll disappear from the catalog. I'll click on another - and that TOO will disappear. This happens until I eject the disc, put it back in, and re-read the directory - then everything will work fine. This seems to happen if the DVD-R has been mounted for a while... could something else somewhere be corrupting whereever Apple stores the file list?
Any ideas what's happening here? It's only a minor (and occasional) annoyance, but I'm curious what it could be.