Thanks everyone.
Vishal number 8 seems to load ok for me, anyone else?
I will have a play with the text colours, thanks.
I have thought about displaying the images bigger, especially the portrait ones are pretty small. I was advised on another forum by quite a few people to lose the watermark, so I don't want to make the images too big with no watermark. I might try changing to 'lightbox' style galleries instead though.