Voice Isolation problem in FCPX after OS 26

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Level 1

10 points

Voice Isolation problem in FCPX after OS 26

Hi everyone, since I updated to OS 26 in Final Cut Pro X, I can no longer use the Voice Isolation feature. The first time I opened Final Cut Pro X, it scanned the plugins and found incompatibilities. I resolved them, but Voice Isolation still doesn’t work. I click it, but nothing happens. The audio and video files I’m using are the same ones I used before, when it worked. I opened an old project where Voice Isolation was enabled, I disabled it, and when I tried to enable it again, it no longer worked. I deleted all the audio plugins I had added and left only the standard ones. Can anyone help me?

Mac Studio, macOS 26.2

Posted on Jan 29, 2026 1:24 AM

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Answer 1

Top-ranking reply

Luis Sequeira1

Level 9

73,698 points

Jan 29, 2026 2:21 AM in response to Mazhoo

1) As always, deleting preferences may help. 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.

2) Create a new library, add a project and a few clips, and test. Same problem?

3) Are you running the current version? Up until yesterday, that was 11.2, and now there is version 12.

Make sure to zip your existing version for safekeeping, then update and see how it goes.

If the problem persists: Please run Etrecheck and post its full report here. Use the "additional text" button and paste the report into the text box.

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Answer 2

Mazhoo Author

Level 1

10 points

Jan 29, 2026 2:57 AM in response to Luis Sequeira1

It works now! I had it revalidate the audio plugins again, and this time it didn’t give any errors. Voice Isolation works. I don’t know why, but it had an issue with Apple’s native audio plugins. Strange. Anyway, thank you so much for your time.

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Answer 3

Mazhoo Author

Level 1

10 points

Jan 29, 2026 2:45 AM in response to Luis Sequeira1

Hi, thank you.

Done, upon reboot after clearing FCPX preferences it found incompatibility with Apple audio plugins, the native ones… strange… It opened anyway, but Voice Isolation doesn’t work.
Done, nothing changed.
Done, I have the latest version of both FCPX and the OS, but nothing. When I updated, I really hoped to fix it, but nothing…

I add the report. I hope it's the right report.

Etrecheck report

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Answer 4

Jan 29, 2026 3:01 AM in response to Mazhoo

Great! Thanks for reporting back.

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