Check this thread
Look at the info for the clips you have on the timeline. Are they all blank-*.mov? It sounds like the same issue I had. I heard that was to be fixed in v3.0.5?
If it's the same issue, the work around to rescue the broken projects is in my replies to my own thread. I had over 100 files to restore, but it was
do-able. You'll need to use finder to find where Lumafusion keeps cached files on Mac.
Tag it so you can find it again!
Also raise it with support, perhaps they could help you out with fixing your projects. They also need to know it ain't fixed yet!
ALSO - in preferences, raise the number of backups from the default of 3 to 20. Those 3 backups get eaten up QUICK by broken projects.
Myself, I paid for the XML export and switched my big project to Davinci on the Mac. I'll keep Lumafusion for smaller projects on my IPP.