A container with bgalpha > 0 and bgcapture=true will block mouse button events from layers below. Is there a way to do the same with mouseover events?
Sooooo.... Never mind. Further tests show that a container layer using bgcapture and fully covering another layer will prevent mouseover events from reaching the underlying layer. But if even one pixel with an alpha >0 peaks out from under it is enough to fire the onover event. That totally makes sense. Now I just have to find my stray pixels.
(I wish there were a way to just delete dumb posts.....)