Possibly just coincidence. A while ago most Google search Sites removed the advanced search link from its previous position and relocated it as a menu item under the Options menu which displays top right as an icon of a cog/gearwheel.

The advanced search should also be available as a link for instance

• http://www.google.co.uk/advanced_search?hl=en <-- clickable link --

It works perfect at the UK http://www.google.co.uk but not the US http://www.google.com

Try clearing your cache and cookies, that may help. See how to clear the cache .

Your US link google.com redirects when I try it, but from google.co.uk I do get an option to use google.com, and that link does not redirect, it works, and provides the advanced search if required http://www.google.com/advanced_search?hl=en

Bravo!! Always start with the simplest solutions. clearing the cache and cookies worked perfect. Thanks so much.

Glad to have helped.