UltraStudio Mini Monitor Suddenly Stopped Outputting to FCPX

So just recently my UltraStudio Mini Monitor just stopped outputting an image from FCPX...no settings have been changed. It optputs to Resolve no problem, just like it always has...I've tried reinstalling the software, etc. Nothing works.

Any ideas on what caused this?

There are two places to check output settings: FCPX preferences and also the Window menu.

Ah, the window menu!

A/V Output was deselected somehow? Weird...but its working now!

Thanks for that, Peter.