next gen gallery

Hi, I’m having a lot of trouble with my nextgen gallery plugin. Basically, it works for the most part except for my thumbnails. They never upload correctly and then when I try to reset them, it says “error updating thumbnail”, leaving me with no thumbnail.

To see an example of this, visit my site at http://www.lyndsayclark.com/leisure and look at the category “Posters”.

Ideally, I’d like this to be an album where you click on it and it shows the thumbnails of what’s inside the album. The functionality is there, but I’d love to have the thumbnails.

Any ideas? Thanks.