Green vertical strip on the left side of screen

I'm using a decklink duo 2 to send an image to my church's LED screen with ProPresenter. When I use the Mac's native output, it works without the green line, but using it with decklink, a green line appears in the left corner of my LED Screen.

Please, any help?

Hello, we are having this same issue. I was wondering if you have figured this out. We are trying to run Powerpoint slides through a ATEM switcher. We too are getting a little green on the left and sometimes white on the top part of the LED wall.

Thanks in advance,
Joe

I HAD THE SAME ISSUE .. We used HDMI cable from ATEM to LED Processor .. Green line on left corner .. We swaped cable to SDI and green line is gone ..