I was very much looking forward to reading Ken Follett's Winter of the World (Book Two of the Century Trilogy) and as luck would have it, just happened to be browsing my local library's e-audio catalog when they posted their new releases (yesterday). I was thrilled to be able to snag the audio version of this book (they haven't offered a digital print version yet), but was disappointed when it would not download.
I called Overdrive tech support and once we ruled out computer problems on my end (firewall issues, etc.) they informed me there was a 'content' issue (corrupted files) released to them by the publisher. It could take anywhere from a week to a month for this 'glitch' to be resolved, so they removed the book temporarily.
Just a heads-up if your library offers it and you are unable to download.