Hi, let me try to explain with the help of a picture: http://imgur.com/Dfmgo
My expectation when getting to the second page would be that the image in the lower left is the last of the album, as this was the order I got through the pictures on the first page, so I'll have the picture on the top right active and wonder why hitting the right arrow key doesn't do anything.
IMO it'd be less confusing if the 2 pictures from the previous page just wouldn't be there, that way each page of thumbnails would behave the same as the first one would.
P.S.: I love your site! <3
Customer support service by UserEcho