Final Cut Pro 11.1 frequently crashing

FCP really taxes the system. The theory is that CMM is overzealous about what it considers "not needed" and deletes critical system files. It's also possible that CMM has damaged your OS and a complete reinstall might be necessary. There are a few threads here about the reset and reinstall process. Basically you reinstall the OS, then reinstall *just* your User data from a backup- *no* Apps or System files. All Apps should be installed fresh from the AppStore or 3rd party developers as you need them.

It depends on what it “cleans”. There is absolutely no need to have any cleaning apps, and they are notorious for deleting files that should be left alone. Heavier more demanding apps are likely to be more affected, and not just FCP. The google keystone, which theoretically exist to keep google chrome and possibly other google apps up to date other notoriously badly behaved and can cause any application using the system videotoolbox to crash or fail in unexpected ways. Poor programming or malfeasance or both in each case. I never allow any of these on my macs, and in particular macs that have been touched by cleanmymac may need a full reinstall depending on the damage inflicted. Fortunately the possibilities for it to do harm are greatly diminished nowadays since they can’t touch system files, but still it is useless at best (and sold based on false premises), and harmful at worst.

I don't have a crash very often, but I developed a workflow routine that has helped a lot to eliminate them. I do this without deleting any FCP preferences files.

1. When I finish work for an edit session, I have FCP delete ALL the library render files.
2. Close the library.
3. Close Final Cut.
4. Done.

The only down side to this procedure is that when you restart FCP, you have to choose the library you wish to work in again. It will not automatically open with an active library.

If FCP crashes or hangs while I am working, I do this:

1. If FCP has hung, I Force Quit the app. (Right-click on the app icon in the Dock, choose Force Quit.)
2. I send the crash report to Apple.
3. I have an EMPTY FCP Library saved to my desktop for easy access. No events, media, or projects.
4. Open the empty library. FCP will start normally with this empty library open.
5. CLOSE the empty Library.
6. CLOSE Final Cut.
7. Re-open Final Cut.
8. Choose the library you were working in when FCP crashed.
9. Go back to work!

This works for me, and I don't have to take the time to delete my preferences file and restore a known good preferences file.

I'd completely uninstall CMM and then follow the instructions at https://chromeisbad.com If the issues are still there then I'd strongly consider reinstalling the OS.

Do please post the Etrecheck report.

Whenever the application crashes, delete its preferences. To delete preferences, hold down command and option while starting the application and click Delete Custom Settings. The application will start with default settings and open an "Untitled" library. Adjust the settings, reopen the library you were working, and see how it works now.

If uninstalling the CleanMyMac junk doesn't clear up the issue, you also have Google's auto-updating software installed. To completely remove all Google's cruft, follow the instructions at https://chromeisbad.com Simply removing Chrome.app is not enough. You may also need to reinstall FCP from the AppStore.

I would think this is your issue:

Get it and all the various and sundry files it generates off your system and test.

MtD