youtube widget forces slide loading

I integrated the youtube widget into my slide. After playing a short speech and showing a screenshot i show some buttons. When you press one of the buttons the youtube widget should be shown.

When i start the demo now, i can hear the sound but no slide and no pics are shown. Theres just a loading icon! After have a minute the visible stuff appears.

When i delete the youtube widget everything works just fine.

is it a known problem or is the something i miss?