MailChimp form not showing up

We're using the Mailing List MailChimp API Key widget to embed our signup form on the Memorial Church website.
http://memorialchurch.harvard.edu/sub....

This has worked fine in the past, but now it's blank, just showing the frame, but nothing in it. When I switch it to the "Basic form", it displays but won't display the "Mailchimp Form" or "Link" options.
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