Yes, this is a problem with OUTPUT.
I have the same suspicions as you – this is a render problem.
I’ve re-rendered the ‘problem’ spots and everything seems to be ok – I opted not to re-render the entire audio tracks out of concern for creating new anomaly problems…
I’m laying back the entire show once more and crossing my fingers…
The deck and computer are being run thru a patchbay and the ref. video is coming from a house tri-level sync generator. We haven’t had issues in the past using our house ref. video…do you think this could be creating issues as well?
Also, how can I prevent multi-channel audio from having anomaly problems using FCP in the future?