So I naively pasted an HTML character sheet interface into the JavaScript editor, commented out, thinking it would be a useful guide as I wrote the scripting back-end; but it had a textarea tag in it, and when I saved it and the web page reloaded, Roll20 decided to render the closing textarea tag ; which, in turn, rendered the "save" and "delete" buttons inoperative. The buttons likely wouldn't be inoperative if they were above Roll20's JavaScript textarea, so that's a temporary fix; but really, the HTML shouldn't have been rendered in the first place, and that should be corrected.