I just sent a message to DaVinci Helpdesk but i wonder if someone else noticed this.
When we render out the final graded Timeline with R3D source files, and open up a rendered frame in Photoshop, when i zoom into the frame there is a 2px border arround the image with dark grey/black color.
If we happen to use the sizing function i DaVinci and zommed into the picture the border is gone, so it only happens to unsized footage.
I f i use a dpx or tiff sequence as source, the rendering is fine, it just happens on R3D footage.
I tried it with half res good and half res premium debayering an it happened in both versions.