Hi,
The DeckLink and Multibridge products provide a video desktop output option. However, this is not the same as a dedicated graphics card. When you start Color, it polls the graphic devices to ensure that you are running a supported graphics card. Since our video desktop output is technically not an OpenGL device, Color will not run and reports an error. This is why you have to disable the video desktop output. However, doing so will not have an affect with monitoring while in Color as our hardware will still be used.
regards
Kristian Lam
Blackmagic Design