FCP suddenly cannot share anymore video file
All of a sudden after having shared many video files, mov or mp4, or captions files, FCP refuses silently to write any file.
The share export menu works as normally, pops up and takes all my choices up to the moment it should start writing the file, but nothing happens.
The pop up closes normally and sometimes, when the background tasks window is opens, it shows a flashing rendering 94% and it returns to idle.
Everything happens as if the file had been normally created. But is has not. FCP runs normally after that apart of this problem.
Exiting library, restarting FCP, changing the destination disk, erasing Preferences ie. pressing Alt-Cmd and starting FCP do not help.
This is now every time I try to share a file. Weird.
Is that a bug, any idea what I could do?
Catalina 10.15.7
FCP 10.5.1
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Claude