I'm having this problem as well, with Hype 3.2.1 (526) Pro and some rather complex, type-centric animations. I've liberally added
127.0.0.1, and my
[machine-name].local domain to Typekit's kit domains, and yet still I get the serif fallback when attempting to render a video, GIF, or PNG sequence. In-browser previews work great, however.
Is there a hacky way to tell the renderer to sub in local fonts, or any way at all to get around this? It seems like it doesn't honor Typekit imports or is simply working from a domain I've yet to identify.