Gravity Forms v1.6.7 is now available via automatic update and the downloads page.
This issue is caused by themes that incorporate code that changes core WordPress behavior and negatively impacts Gravity Forms behavior in the process.
You can update to the latest version of Gravity Forms using Automatic Update. Just visit the Updates page under the Forms navigation in your WordPress Dashboard. Update deployment is staged so if you do not see the update available, try again in a few hours. You can also download the latest version of the plugin from the Downloads page.