Playhead jumps and sound is lost

This just started a few days ago. When I play a movie in my timeline it starts out fine for a few seconds, but then the sound gets lost and the playhead starts skipping and won't recover. Why is this happening all of a sudden? FCPX 10.7.1

iMac 27″, macOS 10.15

Posted on Feb 8, 2024 11:14 AM

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Posted on Feb 8, 2024 11:23 AM

1. Delete the FCP environment settings (start FCP while holding down option+⌘)

2. Select library →File →Delete generated library file →Delete rendering file →All

3. What is the capacity and remaining capacity of your iMac?

5 replies

Feb 8, 2024 3:32 PM in response to Loy1970

Now go into Settings and turn OFF "Background Rendering" and NEVER turn it back on, ever.

Those background renders start to eat up TONS of space (Apple, PLEASE do something about this serious issue) and can get corrupted and cause problems. More problems than they're worth. And most of the time, rendering a timeline is unnecessary.


A system drive (for any operating system) needs at least 15% of its total capacity left as free space at all time. This lets the OS write and read temporary working files you and I never see, hear, smell, or know about. If there's not enough space for these operations to take place seamlessly, all sorts of weird behaviors start to happen. Don't let FCPX eat up all your drive space!

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Playhead jumps and sound is lost

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