I’ve done that to no avail. Bleugh! When I export a sequence with the funny colour shift issue, the export plays as normally (e.g. with the correct colours) in VLC/Quicktime etc.
I have similar problems. I find I spend more time trouble shooting my mac than I do using it at the moment. It’s been a nightmare since mid 2011 ish. I don’t think I remember a single week without something similar happening on my work station. My only conclusion is software/hardware has got to complicated in the last few years.