I don't have many PDFs, though I do have a few -- the Reader is a great way to keep manuals and documentati on hand. However, it also happens when I'm just transferring epubs, so it's probably not a PDF-specific problem. I suspect the actual crashes are something local to my computer, rather than Calibre itself, and I probably won't be able to avoid them; that's why I'm trying to find a way to make Calibre and the 505 recognize the files that have already been transferred.
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