Okay, I took the two menu widgets from the working example and migrated them to another project. I created them and added them to the viewport. I did this in the same place as OP. Only one of them accepts input.
So, what does that leave us with? I mean, surely that rules out anything about the widgets themselves, right? So what are we left with? Level? Controller? Project Settings?
Unfortunately this isnt lines of code I cannot use print strings to figure out where the breakdown is…
I have tried using the widget reflector, but I probably don’t understand it well enough. One interesting note is that when I added the empty widget and hovered over the viewport the whole viewport was highlighted and the empty widget was indicated on the reflector, and it said visible, even though the widget was not set to visible??? Seems important to me but I don’t know what to do about it.