I am using the Zen page theme and latest version. I have created a Page for a way to return to the main site and have listed it first on the menu.

Using Firefox, either of these three addresses, results in reaching the correct page.

1. perioddrama.com/zenphoto
2. www.perioddrama.com/zenphoto
3. http:// (etc)

In using Chrome, if I use #1 or #3 above I reach the menu, but the page link at the top is there, but is no longer a hyperlink.

Using #2, it is there.

I don't have IE anymore to know how that is reacting.

Thoughts?

I think I don't understand. www is actually a subdomain so the addresses perioddrama.com and www.perioddrama.com are technically separate ones. Although most servers are configured to threat them like one (for SEO you should add rewrite rules so accessing one is always redirected to the other - see duplicate content).Http is just the protocol that all browser add themselves.