Hi Chris,
No connection with PPro:
I export my final graded film from DaVinci as ProResHQ.
All colours still look like they should, one on one like in the reference monitor.
Then I use MC to transcode to MOV H264 with 25MB/sec.
This result then shows a clear colour shift towards red in all skin tons and a slight reduction of orange tone everywhere else.
Re importing this files back to DaVinci confirms this also as clear movement in the scopes when comparing to the original ProResHQ file.
When doing compression though with Compressor, it stays spot on same colours.
So, it’s clearly a problem with MC.