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Note that we don't officially support Compressor as we've received many problem reports and some of them resurfaced with the recent updates – you will encounter plugin registration popups appearing repetitively when using the Send to Compressor command in FCPX and Motion.
Therefore, we suggest exporting directly from FCPX or Motion. If there's still a problem, please reinstall the affected plugins using mInstaller or the manual PKG installers that can be downloaded from your 'My Products' page: https://www.motionvfx.com/user/products – the download link will appear once you hover your cursor over the preview miniature.
If you need to use Compressor, there's a workaround for FCPX (not Motion, though): open the File > Share > Add Destination dialog and add a Compressor Settings destination. After that, export your projects by selecting the newly added destination in the Share menu instead of using the Send to Compressor command.
Saving Motion projects in Motion 5.4.6 with the "Save preview movie" option enabled may trigger a similar issue, so we suggest disabling that option in the Save dialog.