Dear Jon,
I had this problem before, I am not able to explain why FCP has problems relinking files sometimes.
Close the Project and re-open it and if these clips still appear to be supposedly “offline” you have two options:
1. right mouse click on the clip in the sequence: re-link media
2. overwrite the sequence clips with the ones from the browser
you could also:
3. find the Folder “Autosafe Vault” in “Final Cut Pro Documents” and look for the file that was safed before you got cut off. Open it and have a look if you still have the same probelm (would be kind of interesting)
x-cuse my english cause I m german.
bye
tashi