Displaying Bugs

I have discovered a bug.

I have a gallery page http://www.chestertonphotography.co.uk/gallery/

In the back-end, if I change gallery>sort images to anything but ‘Custom Order’ the page won’t display any thing.

Also, quite often some thumbnails will not display in the main galleries. It is not always the same images either.

Finally, when clicking the image to view in the lightbox, you can only scroll the amount of images on the current page.
If you have say 3 pages of photos you should be able to scroll all the way through rather than having to close the lightbox and having to change pages