I was having the same trouble. I’m using 184.108.40.206 and have tried it in Firefox and Safari on the Mac. Nothing happened when I clicked “Add New Attribute.”
I opened the Error Console in Firefox and cleared it.
I went into Admin > Catalog > Google Base > Manage Attributes
I clicked on one of the mappings I want to edit.
The Error Console showed an error on the loading of the page:
Error: missing ; before statement
The source file is /index.php/googlebase/types/edit/id/2/
The context of the line pointed to a place in one of my attributes that has an “’s” in its name
I went to Admin > Catalog > Attributes > Manage Attributes and replaced any ‘ in the Attribute Label with
I went back to Admin > Catalog > Google Base > Manage Attributes and clicked on a mapping to edit.
There was no error on page load and when I clicked “Add New Attribute” it worked.
So, the lesson here is, don’t have a ‘ in your Attribute Labels.