FCPX quits immediately upon launch

While FCPX was transcoding footage, the scratch disc mysteriously disconnected from my iMac. I re-mounted it, and everything was still offline. So I quit FCPX. When I tried to relaunch FCPX, now it unexpectedly quits every time.


What I've tried:

• Trashing prefs using Preference Manager
• Zapping PRAM


What else could I try?

iMac with Retina 5K display, macOS Sierra (10.12.6), 32 GB RAM

Posted on Aug 20, 2018 7:38 AM

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7 replies

Aug 20, 2018 3:37 PM in response to Brie-Eating Surrender Monkey

If your scratch disk is connected to a hub and not directly to the mac, make sure the hub has its own power supply to provide the power needed to operate the disk. The Mac only provides enough power to drive 1 (full powered) peripheral over the USB connection. When you spread out that power over several other periphals, they're sharing that singular power and will divide it. A powered hub (usually) provides full power to each of the ports.


Otherwise, try running Disk Utility > First Aid on the disk to make sure it hasn't suffered some corruption.

Aug 21, 2018 6:36 AM in response to fox_m

It's a bare hard drive inserted into a drive dock. It's been a reliable interface for years. No trouble accessing anything on that drive other than the FCPX Library. I'm fairly certain the FCPX Library has been corrupted somehow. Other than ponying up $129 for Digital Rebellion's Pro Maintenance Tools to use their Project Repair tool, I don't dknow of any way to salvage this Library. And I would happily spend that money if I was sure it would fix this.


I have tried bringing the drive to my office to see if it will work there. Alas, it shows the same thing there.


Any ideas are welcomed. Thank you for trying to help me.

Aug 22, 2018 7:59 AM in response to Brie-Eating Surrender Monkey

I've discovered a partial solution from a Creative Cow thread. And in doing so, I've discovered something I didn't know about FCPX.


Here's my partial solution:


I created a new library on the same "problem" hard drive, and created new events with the exact same names as the ones in the corrupted library. Then I closed FCPX. Then I opened up "Show Package Contents" on both libraries and copied everything from the corrupted library to the new library. In my case, the transcoded media alone amounted to nearly a terabyte, so I made aliases of those media files and moved them over.


Voilá. Once I opened up FCPX again, everything I had previously done showed up in the new library intact (including compound clips, synched multi-cam sequences and favorites), but not the projects. The projects never appeared in the new library even when I copied over "CurrentVersion.fcpevent" files from the FCP backups folder. I'm still working out the solution for restoring my project files, but I wanted to report back on the partial solution I've found.


By the way, I did try the 15-day free trial of Digital Rebellion's Pro Maintenence tools. However, there's nothing in there for restoring libraries. I tried it on these projects I can't seem to bring back, though, and although it said it was repaired, it wasn't.


I hope this helps somebody. If anyone has a solution for bringing back my corrupted projects, I'd be grateful.

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FCPX quits immediately upon launch

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