Nextgen Gallery

I installed nextgen gallery on my blog and uploaded some pictures.
When viewed with PICLens all the pictures are visible.
However the thumbnails on the post indicates that there are 5 pages of pictures, but only the first 20 can be viewed, pages 2 – 5 will not load.
My site’s url is: http://getawaytosouthafrica.com and the page or rather the post that I am referring to is “Baviaanskloof Wilderness Area Eastern Cape South Africa”
I would appreciate any help.

Chris