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From the “3D LUT creation workflow for Resolve” page:
Important: When using Resolve 14 or later and an external video monitor, you have to uncheck “Release video I/O hardware when not in focus” under Resolve preferences -> Video and Audio I/O, otherwise the patterns will not update properly! You may restore this preference after all measurements are complete if desired.
What does this mean in practice?
If Resolve goes out of focus, then it simply won’t refresh the external video output if this option is checked.
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