I cannot click on a widget that is in world widget actor (<=don't know if it is the good name)

Hello, I’ve got a very bad problem with my game when I package in Developpement and in Shipping mode (and in every mode…) => When I Play in the editor, I can click on the widget but when I package, I cannot and I don’t know why. I enabled the “Receive Hardware input” in the right column but nothing…
pleas help me! You can find the Video with the bug here

(PS: I don’t speak english, pleas be understanding)