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Hi, after I complete a full render and then I want to do a region render, I lose the full render as it disappears to black when I do the region render or even if I do a region render and then another region render I lose the previous render.
Looks like that hasn't been implemented yet. I'll open a feature request, thanks for reporting.
You can use as temporally solution my script : http://veda3d.com/render-region/