I just ran a few tests with my USB3 BM intensity shuttle.
Using a HDMI output from a mac mini (set to 30p and later 60i)
I am able to capture at the specified resolution from Live Capture, and have the HDMI output work as a Monitor feed (I had issues with some of my displays not supporting 60i)
I am able to output my stage to the Device HDMI output.
I can not:
- switch the output between being a Stage Output, and an Input monitor (requires stopping live capture, and toggling the checkbox on Stage Setup. So can be done manually)
The issue of the device being added on newlines, and with the offline suffix, I believe to be an issue that was fixed some time ago. (I remember testing this).
I would recommend updating your version of Isadora. (you list Isadora 3.0.7)
NOTE: your computer spec is very similar to my own, so I don't believe that will be a factor.