Broken loading animation when click submit gravity form

When enabling this plugin the loading animation does not work when clicking the submit button.

Grafity forms does that by default when ajax is enabled (source below)
But beauty gravity disables it somehow.

Can you help me with this or provide a code to enable it again?

https://stackoverflow.com/questions/12664386/show-a-loading-animation-when-click-submit-gravity-form

The page I need help with: [log in to see the link]