N13, M4 MacMini, Blackmagic New Install Crashing

Hey all,
Have a very strange one in at our studios that we’ve been unable to figure out.

We have a brand new M4Pro Mac Mini here, and installing it like we do all our other macs. We have a bunch of rooms mostly running on Mac Studios. Thought we would try a mini.

We installed N13 latest.
We installed our limited plugin set which works fine on other macs (silicon based VST3’s) - and have tested with all plugins disabled.
We installed Blackmagic Destop Video + drivers for our SDI outputs. This same little thunderbolt 3 box worked fine on a previous M1 Mini and M1Studio.
However, on very first load, play worked - but then as soon as we moved the cursor, we had spinning wheel - slowdown for 10 secs. Then when trying to playback, there was a crash.

Reopened nuendo. Disabled all prefs. Things look like they’re working. However, bring in a video file (which works on other systems here - always prores 1920x1080 Proxy) and video doesn’t playback and we get a crash when trying to playback a second time.

So we suspect its something to do with the blackmagic. The only caveat to that is the person doing the install thinks he got the same crash first time round before he’d even brought in a video file OR even set nuendo to output video. It could be a red herring.

Can someone provide a step-by-step for how we might approach this - and potentially what logs to look at? We have another mini arriving this week - will be interesting to see how that goes. It is just an output machine for assistant, but will be setup the same way as the studios.

Any help would be fab. I’m pretty good at following my nose and figuring things out - but this one has got me stumped. I’m not that familiar with things going wrong with video output - its always just worked here using decklink boxes. We do have a bunch of different output boxes here we can possibly try - and that will be my next port of call.

(All audio here is running on focusrite Red 8 line or Red 16 line boxes. That studio’s box is working 100% on other computers. I’m 95% sure this has nothing to do with the audio engine, but I’ve been wrong before)

Solved.
We tried 3 different sets of blackmagic decklink boxes with no change.
Then noticed that the driver version we had installed on the new mac was newer than our other machines.
We got rid of the new blackmagic drivers - and put on 12.8 - which is from Feb 2024. Only reason we went with that version is it is what is on all our other machines.

And wouldn’t you know it, everything worked.

So. This means that Nuendo 13.0.51, Blackmagic Desktop Video 14.4 and OSX 15.2 have some unpleasent interactions. I would guess that it is the blackmagic drivers at fault, but it could also be something in the nuendo video engine.

This is a link to the Steinberg support page, looks like they’re talking with Blackmagic about it.

Brendan which CPU did you go for? M4 or M4 pro?
What’s your impression in terms of performance?