This has been the bane of my life for months now. First with fcp 6, now with 7. I have no idea why it happens but it is a pain in the butt. It seems to be just with Pro Res footage on our Xsan server. It also seems to corrupt the project too so when you do reconnect, crashes are more regular and any old clip on the timeline will go offline randomly.
You must reconnect each clip individually using the clip info on the timeline. If you are working with names like us (i.e. Clip#5, Clip#6 etc) repeatedly in sub-folders beware of timecode conflicts that fcp will warn you of. In this case choose ‘Try Again’ and try again.
Maybe it is this naming system that causes it, maybe it is a combination of Pro Res, Xsan and Blackmagic. I dont know.
If you are working with a server, moving the media locally helps a lot but doesnt fix.
Can anyone shed some light on this?