Hi
Let's say I've just rendered my image, I then notice a small mistake and want to render a small region to fix it.
I uncheck 'Clear VFB' then draw my region and press render again.
The region renders fine, but the rest of the render outside of the region does this as you can see in the attachment. Using DR
This happens every time I render a region on top of an existing render, which makes unchecking 'Clear VFB' kinda useless.