Black boxes on image

Hello! First of all, sorry for my english, it's not my first language.

So, I have a project with green screen footages from a blackmagic production 4K camera. Footages are in RAW (dng). Shots were plays perfectly fine, untill I graded them. Now I have strange black boxes on images on a preview and in a rendered footage.

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This happens when Color page and Fusion page works together. If I'm turning off the color space transform node - this garbage get disappear.

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PC:
Davinci Resolve 17.0B BUILD 18
Ryzen 7 2700x
32GB RAM
Nvidia 1060 6gb

I've tried to render this project on another PC, got the same issue.
The PC is:
Core i7-4930K
32GM RAM
AMD Radeon R9 390x

There's actually a new forum for version 17 that we're supposed to use.

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