UltraStudio Recorder 3G - no picture

Hi,

First post here, please be patient!
I just received an UltraStudio Recorder 3G and try to use it on a Mac. Unfortunately it doesn't work yet.

The HDMI video sources I tried are a Sony PS4 and a consumer video decoder (that's all what I have at hand).

In Desktop Video Setup, once HDMI is selected I do see the resolution of my source (1080@59.94) but only intermittently (every second or so).
In Blackmagic Media Express, with a project set to the right resolution, I do see sound signal coming in (5 audio channels with the ps4), but also intermittently and no picture.

The USB-C/TB3 cable is an Apple cable.
I tried with 2 different HDMI cables. I tried different resolutions.

I tried with an iMac Pro under X.14.6, with Blackmagic_Desktop_Video_11.6 and even with Blackmagic_Desktop_Video_11.7.
Then I tried with an iMac under X.15, with Blackmagic_Desktop_Video_11.7.

I always get the same results : intermittent sound, no picture.

I even tried to plug my HDMI source to a Micro Converter BiDirectional SDI/HDMI 3G and connect it to the Recorder, but didn't get better results.

Should I considere that the UltraStudio Recorder 3G is faulty, or is there something else I could check?

Your sources could be "conteminated" with HDCP, (copyright protection) if not by that, the HDMI handshake could be making some "misunderstandings" check if your sources have any settings for that, to overcome that,
also use not too long HDMI cables, or check their version 1.x ?
Anything else you might want to try, will fall in the "hacking" (not legal) department, and can't be discussed on any BMD forum group.
Equipment for making your own content should be no problem to use.