Hey, I think I'm experiencing the same issue. iMac late 2015, OSX 10.14.5, FCPX 10.4.6. When it happens to you, are you unable to click/drag the playback head in the timeline and skimming stops working on the timeline – but still works in the event browser?
Just started happening recently after updating my OS and FCPX one after the other.
Trashed FCPX preferences. Haven't tried a clean re-install of FCPX or the OS yet.
There are two things worth trying. One is to reset the SMC - System Management Controller. In my experience, this can cure a multitude of strange issues including those mentioned in the support document and some that aren't, and I find it particularly useful on MacBook Pros. Secondly, there is the old favourite of resetting the PRAM - Programmable RAM. This resets various low-level system settings and is always worth a try when having issues. I would do this after the SMC reset. The only visible up-front settings that get reset are the speaker volume and the screen brightness, but there are some other important parts of the system that are cleaned-up.
You don't say which MBP you have, so in the Reset SMC document, look up the specific method for your Mac.
I have a similar problem. In my case no video file will play in FCPX, VLC, Quicktime and even Safari. Until last week the only workaround was to restart my computer.
This week i tried to unplug and plug again my external audio device (M-Audio M-Track) and the problem was solved. If i switch to internal audio card from the settings the problem also disappears. So in my case it has to do with the Mojave update along with external audio.
I have also serious bluetooth connection problems (after mojave update) as my magic mouse and keyboard tend to disconnect after waking up from sleep.
This is a common problem. You don't need to completely quit FCP, just double-click on the project in the browser. The project/timeline reloads and all is well. This usually happens when copy/pasting transitions, I find.
Redifer wrote: This is a common problem. You don't need to completely quit FCP, just double-click on the project in the browser. The project/timeline reloads and all is well. This usually happens when copy/pasting transitions, I find.
I don't think that is the issue being described. At least it isn't for me. Double clicking to re-open the same Project (or even a different project) does not solve the issue.
After a period of time, when try to I execute playback of the main timeline (either using the Spacebar or Menu Command) I get a brief instance of cursor beachball and then no playback. FCPX in general becomes sluggish. Same thing happens with trying to playback source clips in the Event Browser.
If I restart FCPX (just the app - not the whole system) all is back to normal.
I share the experience of Stasinos: any kind of video will not roll, it’s not just FCPX. Even if I click on a You Tube , Vimeo or a Quicktime movie: it ain’t gonna roll until after I shut down and restart. I’m intrigued by the suggestion that I disconnect my external audio card, which in my case is a Duet 2.
I had wondered if this was happening to anyone else. So if I’m crazy, it’s gotta be another reason.
Thanks for all the feedback on this issue. I tried every fix, mentioned here and on Larry Jordan's site. Nothing seemed to help, until I read about the bluetooth connection. I had been using Powerbeats bluetooth headphones for the rough cuts so I don't bother anyone else.
When I switched to powered/connected speakers (Klipsch), the problem went away. Just finished two days of editing a two hour program, and not a single non-responsive event as before. Only time I had to force quit was when the beachball kept spinning for over 5 minutes during creating a composite clip of a 1 hr segment.
Ahhhh, thank you so much for the Bluetooth headphone suggestion, that's what was causing this error on my 2017 5K iMac, and it was driving me bonkers, because it doesn't happen with my 2012 15" MBP, and I also use my bluetooth headphones on that, so there's a bug with FCPX and bluetooth on the iMac, because both run on the latest Mojave 10.14.6. Someone with connections should tell Apple or the FCPX dev team.
I'd just like to confirm that the issue is indeed caused by monitoring audio with a Buetooth device. In my case, a pair of Plantronics headphones. Disconnecting the device and monitoring via analog output fixes the problem immediately. This is happening on a Late 2015 27" iMac Retina.
I have had this issue for years, and have never found a permanent solution. And I know other Mac owners who have to do what I do. Open Activity Monitor. Find "coreaudiod" and Force Quit. I have to do this every morning now. No one has a clue what is causing coreaudiod to get corrupted.
OMG. I was having this same problem as the original poster. Then, I came across this answer about the Bluetooth. I was using Bluetooth headphones. I turned them off and bingo! It was working again. Ugh! SO MANY HOURS wasted starting and stopping and experimenting. Seems crazy that Bluetooth was the culprit.
I was so elated to find this thread that I had to create an account just to say Thanks 🙏.
I started using FCPX a few years ago and I frequently encountered that playback freezing bug. It's because of this thread I was able to identify that pest and temporarily (unfortunately not permanently) “kill” it.
I initially thought the reason for this freeze was because my MBP 13” (early ’15) was too old and needed more RAM and a better processor, so I convinced my better half to buy me a ’18 MBP 15” with 32GB of RAM (what can I say, my partner loves me). Once I got it, I was super stoked and ready get into FCPX and start editing. But disappointingly, I still encountered the same playback issue; not as frequent, but it still popped up it’s head 😠. This was obviously irritating considering this Laptop was brand new, but at that point, since google didn’t look into the future and find this thread 😂, I just accepted it. So whenever it froze up I did exactly what everyone else did: close/re-open FCP. But now, because of the info I found in this community, my faith in FCP has been restored (somewhat, I run into some random hold ups, but not often enough to warrant a google search).
Getting a new MBP wasn’t completely unwarranted; the MBP 13” couldn’t playback 4K from my GoPro Hero 7 since the video card couldn’t read HEVC.
I had the same issue with my apple brand AirPods. When editing with them, all of a sudden I'd get the spinning ball. Experts told me to try using proxy files but it didn't make sense - why all of a sudden? What was different? OH - started using bluetooth AirPods. Once I switched back to my wired headphones - back to normal.