Quick update to this topic: the visibility issue seems to have sorted itself out for the most part as I’ve continued working on the widget blueprints. I’m still having visibility issues from time-to-time inside the actor blueprint, but it’s in a much more workable state now.
One thing I’ve done that may have affected it: I’ve added some visibility functionality (set hidden in game) to the widget inside the actor blueprint, as well as messed around with keying visibility states within animations for individual widget blueprint components. None of this should have affected it’s visibility in the actor blueprint viewport, but who knows? I seem to have shook something loose in the engine. :]