I'm just going on record to state that Quicktime is, possibly, the worst thing to happen to professional post production that I can think of.
I can't count the dozens, probably hundreds of hours I've wasted noodling around with gamma, re-exporting with 'adjustments', stripping gamma bits from quicktime files, downloading different players, etc...
This problem isn't limited to Resolve, it's every application. As soon as quicktime comes into the workflow there is instant uncertainty of the outcome.
And, to top it all off, there is no guarantee, once you've exported to QuickTime, that an end-user isn't going to view it in the 'wrong' application and get completely buggered colorspace / gamma.
I vote that quicktime be banished from post production. Except Prores 4444, that can stay
Argh!
JT