Next Gen Gallery not working

Hi,
I’ve inserted [gallery=1] on this page: http://afroflowyoga.com/?page_id=1184

It shows nothing but a black box.
When I click show picture list, it does show the photos, but not initially.

What am I doing wrong?
I’ve set the permissions in the folder.
Loaded the Image Rotator in the plugins folder.
Followed the instructions for set up from here: http://dpotter.net/technical/2008/03/nextgen-gallery-review-introduction/

I’m using the Organic Theme and the Themes owners said it should work but it’s not.

Any help would be greatly appreciated!!!
Many Thanks!