Oooh, the plot thickens…
It loads fine as a static HTML page, but when I enable JS, the page goes blank. Console sez:
_ember_jquery-c9524b4….js:46239 Uncaught Error: Could not find module `discourse/lib/emoji/emoji-toolbar` imported from `discourse/plugins/babble/discourse/widgets/babble-composer`
I’m thinking you might need to update or disable the babble plugin, because it appears to be making things sad.