Apple tonight released a maintenance update to Final Cut Pro X to version 10.3.1.
The release notes say that this version:
The update is free and available through the Mac App store.
If you are experiencing these issues, update immediately. Otherwise, as with all software updates, it won’t hurt to wait a few days to see if this creates additional problems.
Also, in general, don’t update if you are in the middle of a big project.
NOTE: If your system updated automatically, you might consider turning off automatic updating in System Preferences > App Store. My personal settings are illustrated above.
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