[Plugin: NGG Video Extend] Loading box animation when clicking on thumbnail

When clicking on a thumbnail, instead of the video it pops up the lightbox with the loading animation. I’ve used all necessary shortcodes and latest versions of plugins.

https://www.ads-software.com/extend/plugins/ngg-video-extend/

EDIT: I solved the issue, I had to change the JavaScript Thumbnail effect from Shutter to Lightbox at the Options->Effects of the NextGEN Gallery plugin!