iOS 7, eBooks and You
A fix is in the works, but in the meantime, the immediate remedy is re-authorize the app with your Adobe ID. If that doesn't work, the next step is to uninstall and re-install Overdrive Media Console app which will also require you to re-authorize with Adobe. IMPORTANT NOTE: A re-install will clear the bookshelf, history, and app settings from the app.
Your Bookshelf of checked-out eBooks will still be available from your eMedia Account so you can re-download any titles you still have checked out.
Refer to the iOS section of this Help article for assistance.
Any news about updates will be posted here.