Can't scroll down on pages when content exists

I built this site (https://jcalegacy.com/) (Genesis, Minimum Child Theme) a couple of years ago and it was working just fine until recently. But the owner has come back complaining that pages with content which extends beyond a certain point don’t allow one to scroll to or access that content. They say all they’ve done is update wordpress and the Genesis framework in the meantime.

If you view the source the content is there.

I updated all plugins.
I added:
`html {
overflow:auto !important;
}`
to the style sheet.
I changed overflow:hidden to overflow:auto in all content areas. And now I’m stumped.

If you click over to the Media page you’ll see the problem. I’ve tried on Mac using Safari, Firefox and Chrome.

Thanks,
Lisa