[Plugin: NextGEN Gallery] updated nggallery and optimized databases, next page stopped working

Hi,
When I updated the plugin to Version 1.9.1 it said that the plugin wanted to optimize the databases only after doing this the links to additional pages underneath the thumbnails stopped working and now give an error message saying the page doesn’t exist.

An example page is http://futuresteel.com/steel-building-interiors.html

Any idea what could fix this?

http://wordpress.org/extend/plugins/nextgen-gallery/