I was always annoyed by NGG starting with with a loading image, so tried out this plugin, - well, at least on six different sites.
Whenever I installed it, EVERY SINGLE EXISTING SLIDESHOW on EVERY SINGLE INSTALLATION turned into a loading image on the top left - and I am not even using any other Thickbox, Lightbox plugin!
Read FAQs, uploaded images again, recreated thumbs (yes they were still there) etc...
No luck so far.
Would be so great if this thing would work out of the box.