Oh, I should also say that this has stopped working on a site with the following set up too: WPv3.4.2 and CF7v3.2.1
Oh, and obviously I have changed the site URL and GA ID in the above examples!
And also, I should say that of course, _setAccount has already been declared in the GA script at the end of the <head> on the page. I was clutching at straws when I declared it again on that last attempt!