I have just had an interesting thing happen re adding a form to a Wordpress page.
The form seems ok and is active.
I write the page then go to add a form. I select the 'add gravity form icon' and the window comes up.
The one titled.. Insert a form... Select a form below to add it to your post or page. etc
I choose my form and press 'insert form' . The page just holds and does nothing.
I do exactly the same thing on exactly the same page and it all works. The shortcut is added to the page [gravityform id=1 name=Feedbackor comments]
I tried turning off all plugins incase of conflict and nothing seems to have altered.
Forms have been added using Safari to other domains of mine without problems.
So it does seem to be a browser issue with this particular theme/ browser combination possibly?
Here is the final page http://www.heritageandhistory.com/contents1a/contact-us/