Troubleshoot: "Message Editor Loading" message doesn't load editor

If you're creating an email using an existing template and see a "Message Editor Loading" message that does not ever resolve, or you're unable to click on the "Open Message Editor" button, this may be because the domain is being blocked by your local network.

Make sure that your network is set to allow traffic to and from the domain "*" without restriction. It is also suggested to whitelist "*"  and "*" This is required to load the template editor, and whitelisting that domain on your local network should resolve the issue.

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