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GT inputs show up as blank

GT inputs may show up as blank if multiple graphics cards are being used in a PC.
To check this, make sure all monitors and displays are plugged into only the graphics card and not the ports on the motherboard.
 
If you are using a laptop, make sure vMix is set to use the dedicated graphics only:

Last Updated: Tuesday, 2 July 2019 6:09:38 PM