I edit in Premiere on a new Mac Pro 12-core 3.3GHz Xeon W with 192 GB RAM and W5700x 16GB GFX Card. This problem happened as well when I connect via new maxed out 16" mbp.
I have the Ultra Studio 4k Mini working with the system. But the reference monitor, which is the blackmagic 12g 4k monitor designed to work with the box receives the signal only on occasion. It's so annoying.
I use new 12g SDI cables. I have tried many. I use OWC short (18") thunderbolt cables and the Ultra Studio never has trouble connecting because the video always plays on the tiny display whenever premiere is open. But the signal doesn't reach the monitor.
Usually I open video Setup utility and just switch the settings around, shut them both off, switch the sdi cables from A to B, etc. but there's no rhyme or reason to any of it. If I'm lucky it connects. But normally I just leave it off because it's too much work.
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