Worked until last week, now pop up is blank

All of a sudden after using this plugin for 2 years, the modal is blank. My external website content is not displayed anymore in the iframe.

Here is the link:
<a class="modal-link" href="https://docs.google.com/spreadsheets/d/e/2PACX-1vSZnLBU9U2q8fbRcrMEFX5J2pG-n9jHm18HeGARzoE-JIalNh3IEJd-Jqlf8RI4aAWgD4dkC--MN-6r/pubhtml?gid=1580156689&chrome=false&single=true&range=A16" title="Read full description" data-div="sheets-viewport">Read more ...</a>

I don’t see any issues on the source for the modal:
https://docs.google.com/spreadsheets/d/e/2PACX-1vSZnLBU9U2q8fbRcrMEFX5J2pG-n9jHm18HeGARzoE-JIalNh3IEJd-Jqlf8RI4aAWgD4dkC–MN-6r/pubhtml?gid=1580156689&chrome=false&single=true&range=A16

And here is the link to the WP website on which the link appears:
https://community.coerll.utexas.edu/
(See all “Read More” links when names are expanded)

I did not change the Read More links at all in the past year. Auto plugin updates of is turned on.

Any help is appreciated, since I need to get this to work again as soon as possible.

Thanks!

• This topic was modified 5 years, 9 months ago by blaagrrrl.