Conflict with Gravity Forms in the modal window on the post edit page.
Clicking the forms link opens the Gravity Forms header, but replaces the content with yours.
From their support forum:
This is a bug on their end. They copied our code to create their shortcode wizard and they didn't change the ID of the window they open. They need to change the ID of the modal window they open. They hijack ours because they used the same ID that we use because they copied our code but didn't completely customize it for their needs.
I think they meant this as kindly as possible. :)