I am successfully using the NextGen Gallery, and have activated the Shadowbox JS plugin and NGG Video Extend. I set up everything according to the NGG Video Extend instructions, but cannot get videos to play.
And when I change the Gallery 'Options->Effects->Javascript Thumbnail Effect' from 'Shutter' to 'Lightbox', I actually lose all lightbox effects for all my galleries, and instead get a blank white page with a selected image in the upper left corner.
Any ideas? Thanks!