Just downloaded an update to iOS7, the maps that I had downloaded for the second or third time (only Japan and Australia) are gone. Am in the process of downloading them again, even tried restoring my ipad backup from iTunes but received a corrupted file message. Just opened my monthly bill for my data on iPad, $236 Australian. The biggest downloads have been the initial download of maps and the following download after iOS7 install. This is fast becoming the most expensive app in the app store.