I don’t know when (i use many time VMR9/EVR Windowed) and why not working vmr9 Renderless and evr renderless (Custom Present), have sound no video. Vmr7 renderless – ok. Renderless vmr9/evr windowed – ok. vmr9 renderless and evr renderless in MPC – ok.
I found the reason: if you use the “Direct3d Overrider (RivaTuner)” program with the DPot with Vmr9 renderless and evr renderless does not show image. Disable (Non) in Direct3d Overrider for DPot with Vmr9 renderless and evr renderless (Custom Present) – vmr9 renderless and evr renderless (Custom Present) working ok. In Direct3d Overrider no have name DPot. I added DPot and enabled (Hight) for DPot in Direct3d Overrider for the Windowed mode. https://www.cubbyusercontent.com/pl/35te453tey43u76urier826wy.png/_68f1ae5a06374626a3dbfdc644abf281