I think I have the same problem as johnclark00. My thumbnails don't appear on the Manage Gallery page, although they appear correctly on the site when I insert an album using the [nggallery] short code. And I also can't view the image from the Manage Gallery page.
The problem seems to be that on the Manage Gallery page, the spaces are being taken out of the path name to the thumbnail and to the image. For example, if the image is here:
example.com/photos/2012/Family Reunion 01.jpg
The link from the Manage Gallery page becomes this:
with the spaces missing.
I also am not using Contact Form 7, and am using the Atahualpa theme.