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Blackmagic output troubleshoot

Unreal engine and decklink Blackmagic Output

Hi there, does anyone know why my BMD Decklink doesnt want to load in the BM Output module in UE4, but loads perfectly in UE5?

I’ve tried it on 4.25, 4.26, 4.27

I’ve tried a decklink Duo 2 as well as a Decklink 4k sdi both render the same results?

Uninstall, re-installed UE and BM Desktop Video. Rolled back to v 11.5 on desktop video, then back to 12.1 to no avail.

any advice would greatly be appreciated.