using 4.11p7 the mouse doesn’t register umg hover or click events immediately. Only after you click once anywhere on screen the events fire.
unless i’m missing something this isn’t expected behaviour, but a bug ?
tried it in a new project :
setup a quick button umg, with click event print string. create a playercontroller blueprint and create the widget , add it to viewport, and set show cursor node. Create a gamemode to use the player controller.