Thank you for reaching out to the Community. Is the email list you are trying to select not showing when you are scheduling an email campaign, or when you are accessing your contacts management page? If this was not a step taken, you can also try using a different browser to determine if this may be browser related or not. For a more thorough investigation you can email us at social_support(at)constantcontact(dot)com with a screenshot of the page you are experiencing this issue in and a reference of this post.
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