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MacPro2019 - BlackMagic DaVinci Card
Program monitor and timeline showing up in my HMDI output via Blackmagic card.
Source Monitor - nothing.
Tried turning Mercury Transmit on & off.
[Moderator note: title modified for clarity in asking for assistance.]
Which card, and are you using the BM Desktop Video controls?
The Mac OS might see the BMD videp capture card as a second monitor. You might have to dissable that in the Mac OS. All I can do is post a few Windows 10 video links that might help. https://youtu.be/barrJWuBzCA https://youtu.be/ZnqcUYcJIaE