as stant suggested we need to look at the map's galaxy file to help you.
it sounds like the map after the updater has run is damaged, but as I had tested the latest version and all previous versions of the map updater with each map format version and PLAY TESTEd the test maps during the development of the map updater, it might be best to put both the old version and the new version in an achive and upload the archive somewhere and post a link to it so we can help
harpo