Thank you for reaching out to us through the Community. I'm sorry to hear that you are experiencing issues with restoring your deleted campaign. I will like to look into this further for you. Could you please email us at social_support(at)constantcontact(dot)com with the title of the email campaign you want to restore as well as a reference to this post?
The Third-Generation editor is the direction that we're moving, and is the editor that we plan to develop on and introduce new features to. Our New Editor has drag and drop functionality, and is designed to look great on mobile devices. You can still access the legacy editor by copying previous campaigns, but we'd love to hear your feedback on the new editor if you have a chance to jump in and use it!