(Hi all, I'm the PM for the Dropbox desktop client team.)
I just wanted to let you all know that we take any claims like this really seriously. There aren't any known bugs on the Dropbox side that would cause this, and unfortunately there are potential causes such as hardware errors, filesystem corruption, and other OS issues (including those like http://www.phoronix.com/scan.php?page=news_item&px=MTIxN... which another poster pointed out) that can corrupt data or create zero byte files.
Nevertheless we will continue to look into this just to be sure, and we also work hard to find ways for Dropbox to shield users even when the OS, disk or other components fail (our undelete/file revisions and Packrat are among these).
I just wanted to let you all know that we take any claims like this really seriously. There aren't any known bugs on the Dropbox side that would cause this, and unfortunately there are potential causes such as hardware errors, filesystem corruption, and other OS issues (including those like http://www.phoronix.com/scan.php?page=news_item&px=MTIxN... which another poster pointed out) that can corrupt data or create zero byte files.
Nevertheless we will continue to look into this just to be sure, and we also work hard to find ways for Dropbox to shield users even when the OS, disk or other components fail (our undelete/file revisions and Packrat are among these).