[Jeff Bemiss]

I’ve had this problem too. In my case, it’s not that media is offline, because I get no flags and the clip I know should be there is still safely in my library.

The two things that make me suspect a bug are 1) as the original poster said, transitions remain inside these secondary storylines, which remain connected where they should be, but the clips are gone, and 2) I’ve had this happen to ALL of my secondary storylines at once, both the above video and the below audio.

I’ve never had it happen more than once per job, and I have noticed that when it does happen, it’s when I am launching FCPX for a new work session. I saw a poster on the Apple discussion forum complaining of the same problem who said it happened when he was duplicating projects and importing XMLs.