As I asked before, what are the settings for the recording on the camera? Have they changed since your first successful ingest? Have you switched from recording in 60i, which is interlaced video and supported in FCE, to 60p which is not?
You can also try to trash your FCE preferences, by going to Digital Rebellion and downloading (free) Preference Manager:
http://www.digitalrebellion.com/prefman/
Trashing your FC preferences is the usual first step when FC runs unexpectedly. They will be restored to defualt settings then next time you launch FC.
MtD