Arrows Not Working

I’m having a brilliant time with FooGallery! It’s saving me days of work in large image galleries and the features are outstanding. However, I can view my gallery and click on a thumbnail without a problem. The image expands and I have it in the Foobox window. But when I click on the left or right arrows to move through the gallery images, I just get a white Foobox. The counter below the window counts up and down but I can’t display more than one image. Any thoughts?