I recently upgraded to Big Sur and cannot get my Blackmagic UltraStudio Mini Recorder to work in OBS. The option "Blackmagic Device" is available in the list of sources but but cannot be found under source properties. It just shows a check mark where my device should be listed. I am able to use the internal camera of the Mac as a video capture device but my Blackmagic won't work. Everything worked fine with Catalina so I'm wondering if this is a Big Sur issue.