[Plugin: Nextgen Gallery] Slideshow images not filling area

Hi,

I’ve been getting an odd visual effect when viewing nextgen galleries in a slideshow. It looks like the images don’t fill the allocated viewing area completely so there is a large white boarder on the right and bottom of the images. The problem can be seen here on my home page https://www.photosbykev.com/wordpress/

Any thoughts? or is there something I’m doing incorrectly? The site has been used Nextgen for a long time and this is the first significant problem I’ve had so far.

regards
Kev Lewis