I was downconverting a DVCPro HD 720P60 project to SD 16x9 letterbox using the DeckLink System Preferences Output Processing feature but the actual output looked like it was outputting one frame (or field) of letterbox and another frame (or field) of anamorphic. Just constantly jumping back and forth.
I restarted and had the same problem :(
Any thoughts? It took 40 minutes to render to an SD timeline in FCP and I'd love not to have to do that every time.