Q Light Controller+

I've tried v5 Beta 3 and the appimage QLC+-qt5qml-5.0.0-20240321-9b03743,
Button Black Out do not affects any function but the loopbacks (?)
I've noticed it in a recent show where I use them.
test file: > play scene dim 1 and dim 2
> press BO >> nothing
> play loop 1
> press BO >> dim 2 is released

Not sure what you're trying to achieve, but blackout cannot be seen with the fixture monitor.
It affects outputs, so to "see" it you need to have the actual fixtures connected and see them going dark.
As far as I can tell, what you see is correct cause only loopback (which represents an actual output in QLC+) changes state

Ok I wasn't aware of that.
It was a performance with some manual BOs, probably I was checking the midi controller, right now I don't remember what I did then. Thanks to look at it.