I apologize this has still happened after following the previously mentioned steps. What is the name of the campaign you are working on? The browser you are using? Are you receiving any error messages? You mentioned this happened on the scheduling page as well. Did you see this change in the preview icon, or a test send of your email? Having any further details this experience will allow us to troubleshoot this campaign for you. In the meantime, I would even suggest testing your campaign in a different browser or a private/incognito window.
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