No the source footage is prores 4444 field none progressive rendered from FCP 7. Is that redundant? If there are no fields then it must be progressive right?
I had the same problem. I went to https://support.apple.com/downloads/
and downloaded:
Pro Application Support 2.1
This update provides improvements for Apple s professional applications, and is strongly recommended for all users of Final Cut Pro , Cinema Tools, Compressor, LiveType, Soundtrack, and DVD Studio Pro. This update improves general user interface appearance and reliability and is required to receive future updates for these applications. https://support.apple.com/kb/DL570
Download
restarted my laptop and voila!