JavaScript error with background images

I don't remember making any changes to my server, Mac or Little Snitch, but recently I've been getting JavaScript errors that are preventing background images from displaying in Preview (within Rw or if I preview in Safari/Chrome/etc.). In the screenshot below, I'm using a drag & drop image (Sections Pro >> Background), but my normal workflow is to warehouse them. When I do, the images don't show and I get the JS errors shown. They're fine once published, of course...but, it makes it difficult to see how it'll look prior to being published. Thoughts?

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