When an existing OverDrive Media Console (OMC) user upgrades to iOS 7, the app will fail when trying to open a DRM-protected eBook. New or first time users of OMC are unaffected by this issue. We are resolving the issue but in the meantime, here are immediate remedies for users:
1) Re-authenticate the app with their existing or a new Adobe ID. Read more at http://help.overdrive.com/article/0059/What-to-do-if-a-title-is-not-properly-loading-or-OverDrives-mobile-app-is-crashing
2) Uninstall and re-install OMC which will also require the user to re-authorize with Adobe. IMPORTANT NOTE: A re-install will clear a user's bookshelf, history, and app settings.
Audiobook users won't notice that anything is different unless they attempt to download parts of audiobooks they already downloaded to OMC before upgrading to iOS 7. A user will receive an error message informing them to download the title again.