I am also having a similiar problem to this.
I've uploaded like 1500 pictures, all of them are in Zoom Gallery just fine, and its made the thumbs for them fine (Zoom works fine)
I installed this plugin and have it published...When I click on the gallery tab its a blank area, with:
Following images are added by this user:
Under that, its completely blank. However, when I move my cursor around the blank area I can see the cursor is seeing something, so I click and it opens the gallery(s)
So its entered the info correctly on that page, its adding the images, just not displaying the thumbs.
Any ideas?