YoutubeGallery Theme Not Set
Since Youtube Gallery 3.x you need to select not Gallery but Video List and Theme
In Menu Item and Module select Video List and Theme
In Plugin
Replace {youtubegallery=video}
With {youtubegallery=VIDEO_LIST,THEME}
OR
Replace {youtubegalleryid=1}
With {youtubegalleryid=1,2}
Where 1 is Video List ID and 2 is Theme ID
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