@nik This was the board I tested it on. 😆 I'm not sure if @julian can shed some light on this as something isn't right with your experience and I'm not sure what would cause these things to happen. It's not your build of NodeBB, it's not one browser or the other as it happens on both Desktop & Mobile, the only thing left is your internet connection, but I don't know whether xhr-polling or websocket issues would cause it.
Ok, the Google ad will not show on the home page or category page, only on topic pages. Scripts from another ad provider does not work and the side will not load. The HTML widget, me thinks, should be able to render any HTML/JS script.