Select Delete Preferences when prompted.Start Final Cut Pro X whilst holding down COMMAND + OPTION.Not sure why but it is an easy step to clear them and won’t affect any of the work you have saved. Sometimes your preferences can cause issues with Final Cut Pro X. These files can be regenerated but this may take a while so you may want to try Step 3 first! If deleting all the Render files does not work then select Delete Optimized and Delete Proxy Media too.Go to File > Delete Generated Library Files….Select your Library in Final Cut Pro X (this is the icon that looks like 4 little squares with starts in it).Deleting them can, in some cases, help to fix any issues that are popping up. Sometimes render files can get corrupted and as Final Cut Pro X tries to save time on re-rendering it will use those render files in the export process. Step 5 is to contact Apple and you may want to do that ahead of these steps if you are unsure of some of the technical detail below. If this doesn’t work proceed to Step 2, 3, 4 or Step 5. Watch my Solve Export Problems video on YouTube. You can leave a comment on the YouTube video below.

I continue to update page so if you have any tips or tricks that I missed or other techniques that worked for you then please let me know. These fixes may help you in your quest for a solution. I’ve also collected some other steps and a variety of solutions that have been gathered by other Final Cut Pro users. It will help you find issues with plugins and resolve conflicts in your edits. I’ve collected tips in the video below and that is a good place to start. If you are having issues with exporting from Final Cut Pro there are a few things to try.

Final cut pro 10.3.4 adjust timeline