For most people who arrive on this question from a Google search, the advice that you're probably looking for is to add the following to the "additional settings" section of the Contact 7 admin within WordPress dashboard:
(see this post)
For others, you can modify the scripts.js file using the instructions from @jcstewart in that same post.
But for me, this hasn't helped. I, unfortunately, removed the wp_footer tag from my theme because I have pages showing up in a thickbox page; when the thickbox is closed and reloaded, it would load an additional thickbox underneath (very frustrating).
How can I get around this?