There is an explanation and work-around in the app store.
Quote:
*** Attention iOS 7 users ***
The upgrade to iOS7 has resulted in problems for many OverDrive Media Console users.
We are working on getting a new version into the App Store. If you do not want to wait for the fixed version, you can complete the following steps -- but note in advance that they are not ideal as re-installing will clear your bookshelf, history, and app settings...
1. Uninstall OMC.
2. Re-install OMC.
3. Re-authorize your device with your Adobe ID when prompted.
4. Download your title(s) again.
Thank you for your patience.
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