Exporting Session, Saving copies of files causes audio to be corrupted

Where exactly are you exporting these files to? I'm only aware that people have had difficulties when they've tried this over a network connection - that's almost guaranteed to cause difficulties. If you want to save files to any sort of network drive the way to do it is to save them locally first, and then do the file transfer manually, rather than do the save to a remote drive. Why? When a file transfer takes place, the entire operation is under the control of the operating system, but a save involves Audition expecting to find a location always available - it cannot handshake a remote network connection where that isn't at all guaranteed to happen.