kdamalie
Obvious question #1 (sorry)... are you certain you have selected the correct signal format (resolution/frame rate etc) in the settings.
Workaround / check - try connecting to the ATEM 1ME via it's HDMI program output instead. That is the way I connect from my 1ME to my Intensity Pro. It's better (in my opinion) as it gives the highest quality digital video and embedded audio in one simple cable.