Wouldn't you know this software got release just after I picked up a HDMI>USB converter!
I've noticed the same thing with Fuji's software. Nothing comes up in OBS, but it works OK in Zoom, Slack and Skype. Thanks to
@Wawawum I've got the workaround using Manycam - but through from Camera > Fuji X Webcam > Manycam > OBS > (video conf) it does introduce some display lag!
There's definitely some bugs that need to be ironed out, but kudos to Fuji for getting it out there so it's available to be used, even if it isn't polished.
What I've noticed is that if one piece of software is using the Fuji capture device, and then another program tries to access it, the first program tends to crash. Eg, If Manycam is accessing the Fuji cam, then I switch Skype to use the Fuji cam, Manycam will crash. And vice versa.