OK, I went and checked for zipped folders and such -- no luck; everything's unzipped, so far as I can tell. However, when I click on 'Open path' for one of the books, the path it's using is nothing like the path at which the actual file is found (which has an annoyingly large number of nested folders; something like 6). Any suggestions on how to remedy this? My current thoughts are to delete the entries from calibre for anything that's not found like this, and re-add them... Since I've already done title/author edits and such, though, I'd like to avoid that if possible.