Good news. Your intuition was good. I was able to speak with Apple: I had filed the original audio files that i had imported into the project, into a folder on my hard drive (in order to organize my audio files.) I removed them from this "subfolder" and PUT THEM BACK ONTO MY DESKTOP. I re-opened iMovie and these audio files had all repopulated the movie timeline in their proper places. I haven't figured out yet how to get these audio files into the iMovie Events folder, so for now, just making sure my audio files will remain available to iMovie on my desktop until I've completed the movie and exported it. If you know how to import them into the Events, to sync up with the actual Project, please let me know. Thank you!