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Random shift in colors happening during playback and export

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Mauricio Lleras
Random shift in colors happening during playback and export
on Nov 20, 2017 at 7:35:30 pm

Hello all,
I'm on Resolve 14.1, grading a project for a friend on my 2017 Imac.
I'm getting this very annoying issue: sometimes the correction I've applied to a shot seems
to shift for a couple of frames, usually getting darker and crushing blacks, as if there were a gamma issue.
It will happen randomly, and sometimes disappear after a couple of playbacks,
but sometimes these flashes remain even on export.
It is also hard to spot as they may appear on different places upon export than where they appeared on playback.
It also makes it unnerving to grade as sometimes almost a whole clip is affected and
you don't know where the proper color grade lies...
Anyone has seen this and knows of a fix?

I'm on Sierra (10.12.6) on a late 2017 Imac with a Radeon Pro 580 , 8 GB of VRAM gfx card but sadly
only 8 Gb of total ram for the moment (hadn't expected to get a job at home so soon so haven't had the time to buy more ram).
Also, because there was no budget or time footage wasn't transcoded and remained as H264 original clips,
may this be the culprit? Still it seems very weird that it happens so randomly...

Any help is appreciated!

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