WordPress leaves image source attribute empty

I maintain a wordpress site for a fiber artist at susanelaine.com. It’s a basic install with a custom theme (Hero, by Theme Trust). The site sat with no modifications for about a year. During that time, it auto-updated regularly. It is running 4.8.2, and all the plugins are up to date.

When I came back to the site to add new content yesterday, it was as if my account had no privileges. I couldn’t create pages, upload images or modify users. With the help of my hosting company, the problem was traced to a database corruption, which was fixed.

Today, I could upload content, but when I upload images, they appear as blank tiles in the media library. When added to the page, WordPress leaves the image source attribute empty (src=””). Of course, the images do not display on the page or the editor. I can find the url for the image in the database and paste it into the page, but it’s not a good workaround. (The theme, for one, still doesn’t know where the images are.)

I’ve disabled plugins, cleared the cache, checked filesystem privileges, checked the upload file path, and had the hosting company look at the .htaccess file. None of these make any difference.

It sounds like there’s an uninitiated variable somewhere in the code, but I have no idea where to look. Scratching my head over this one.

The page I need help with: [log in to see the link]